diff --git a/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts b/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts
index 55ec0e0ae..6fdba8073 100644
--- a/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts
+++ b/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts
@@ -2,7 +2,6 @@ export const FNRS_CNSLTN_VIEW_BUTTON_ACTION = {
   strg: "strg",
   aply: "aply",
   del: "del",
-  splmntCmptn: "splmntCmptn",
   fnrsCnsltnAncmnt: "fnrsCnsltnAncmnt",
   envoSbmsn: "envoSbmsn",
   rjct: "rjct",
@@ -32,7 +31,6 @@ const ROLE_STATUS_BUTTON_ACTIONS: Record<string, Record<string, FnrsCnsltnViewBu
       FNRS_CNSLTN_VIEW_BUTTON_ACTION.aply,
       FNRS_CNSLTN_VIEW_BUTTON_ACTION.del,
     ],
-    SL: [FNRS_CNSLTN_VIEW_BUTTON_ACTION.splmntCmptn],
     TA: [FNRS_CNSLTN_VIEW_BUTTON_ACTION.fnrsCnsltnAncmnt],
   },
   ROLE_USER04: {
diff --git a/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts b/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts
index 276fe6e9c..8bfc0c317 100644
--- a/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts
+++ b/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts
@@ -83,6 +83,24 @@ export const fnrsCnsltnRegistSchema = z.object({
       atchFileGroupId: z.string(),
     }),
   ),
+  splmntDmndList: z.array(
+    z.object({
+      splmntDmndSn: z.number().optional(),
+      splmntArtclComCd: z.string().optional(),
+      splmntArtclCdNm: z.string().nullish(),
+      splmntDmndCn: z.string().optional(),
+      splmntDmndDt: z.string().optional(),
+      splmntDmndAtchFileGroupId: z.string().optional(),
+      splmntDmndAtchFileNm: z.string().optional(),
+      splmntCn: z.string().optional(),
+      splmntPicNm: z.string().optional(),
+      splmntCmptnDt: z.string().optional(),
+      splmntAtchFileGroupId: z.string().optional(),
+      splmntAtchFileNm: z.string().optional(),
+      splmntAtchFileAtflId: z.string().optional(),
+      cmptnYn: z.string().optional(),
+    }),
+  ),
   privacyConsent: z.enum(["Y", "N"], {
     required_error: "개인정보 수집/이용 동의는 필수입니다",
   }),
diff --git a/apps/as/src/pages/fnrs-cnsltn/lib/form-data-mapper.ts b/apps/as/src/pages/fnrs-cnsltn/lib/form-data-mapper.ts
index d76887394..82707757d 100644
--- a/apps/as/src/pages/fnrs-cnsltn/lib/form-data-mapper.ts
+++ b/apps/as/src/pages/fnrs-cnsltn/lib/form-data-mapper.ts
@@ -34,6 +34,7 @@ export function mapDetailToFormData(data: FnrsCnsltnMngDetResponseDto): FnrsCnsl
   const bizCstList = data.bizCstList ?? [];
   const cklstResultList = data.cklstResultList;
   const esntlFileList = data.esntlFileList;
+  const splmntDmndList = data.splmntDmndList;
 
   return {
     fnrsCnsltnMng: {
@@ -94,6 +95,23 @@ export function mapDetailToFormData(data: FnrsCnsltnMngDetResponseDto): FnrsCnsl
         picRvwCn: item.picRvwCn,
       })) ?? [],
     esntlAtchFileList: mapEsntlAtchFileList(esntlFileList),
+    splmntDmndList:
+      splmntDmndList?.map((item) => ({
+        splmntDmndSn: item.splmntDmndSn,
+        splmntArtclComCd: item.splmntArtclComCd,
+        splmntArtclCdNm: item.splmntArtclCdNm,
+        splmntDmndCn: item.splmntDmndCn,
+        splmntDmndDt: item.splmntDmndDt,
+        splmntDmndAtchFileGroupId: item.splmntDmndAtchFileGroupId ?? "",
+        splmntDmndAtchFileNm: item.splmntDmndAtchFileInfo?.orgnlFileNm ?? "",
+        splmntCn: item.splmntCn ?? "",
+        splmntPicNm: item.splmntPicNm ?? "",
+        splmntCmptnDt: item.splmntCmptnDt ?? "",
+        splmntAtchFileGroupId: item.splmntAtchFileGroupId ?? "",
+        splmntAtchFileNm: item.splmntAtchFileInfo?.orgnlFileNm ?? "",
+        splmntAtchFileAtflId: item.splmntAtchFileInfo?.atflId ?? "",
+        cmptnYn: item.cmptnYn,
+      })) ?? [],
     privacyConsent: "Y",
   };
 }
@@ -130,6 +148,7 @@ export function getCreateDefaultValues(
     fnrsSharList: [],
     cklstResultList: [],
     esntlAtchFileList: [],
+    splmntDmndList: [],
     privacyConsent: "N",
   };
 }
diff --git a/apps/as/src/pages/fnrs-cnsltn/lib/save-payload-utils.ts b/apps/as/src/pages/fnrs-cnsltn/lib/save-payload-utils.ts
index 7c4782dbb..fb34d7d0e 100644
--- a/apps/as/src/pages/fnrs-cnsltn/lib/save-payload-utils.ts
+++ b/apps/as/src/pages/fnrs-cnsltn/lib/save-payload-utils.ts
@@ -112,8 +112,7 @@ export function buildSupplementReqPayload(
     toSplmntDmndSaveItem(item),
   );
 
-  const nextSn =
-    existingItems.reduce((max, item) => Math.max(max, item.splmntDmndSn ?? 0), 0) + 1;
+  const nextSn = existingItems.reduce((max, item) => Math.max(max, item.splmntDmndSn ?? 0), 0) + 1;
 
   const newItems: FnrsCnsltnSplmntDmndItem[] = payload.items.map((item, index) => ({
     splmntDmndSn: nextSn + index,
@@ -129,7 +128,7 @@ export function buildSupplementReqPayload(
   };
 }
 
-function toSplmntDmndSaveItem(item: FnrsCnsltnSplmntDmndItem): FnrsCnsltnSplmntDmndItem {
+export function toSplmntDmndSaveItem(item: FnrsCnsltnSplmntDmndItem): FnrsCnsltnSplmntDmndItem {
   return {
     splmntDmndSn: item.splmntDmndSn,
     splmntArtclComCd: item.splmntArtclComCd,
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx
index 46d8f9eee..d55333763 100644
--- a/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx
+++ b/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx
@@ -40,8 +40,8 @@ import { computeReviewStepChecklistProgress } from "../../lib/checklist-utils";
 import {
   buildSavePayload,
   buildSupplementReqPayload,
-  buildSupplementSubmitPayload,
   buildTechReviewReplyPayload,
+  toSplmntDmndSaveItem,
 } from "../../lib/save-payload-utils";
 import { type ChecklistFormState } from "../../model/view-types";
 import type { TechReviewOpinionSectionHandle } from "../sections/tech-review-opinion-section";
@@ -219,15 +219,6 @@ function FloatingActionButtons({
     router.push("/fnrs-cnsltn");
   }
 
-  async function handleSplmntCmptnClick() {
-    const payload = buildSupplementSubmitPayload(data, checklistFormState);
-    await executeAction({
-      action: FNRS_CNSLTN_VIEW_BUTTON_ACTION.splmntCmptn,
-      request: payload,
-      successMessage: "보완완료 처리되었습니다.",
-    });
-  }
-
   async function handleFnrsCnsltnAncmntClick() {
     const payload: DocPrgrsUpdateRequestDto = {
       docNo,
@@ -380,15 +371,18 @@ function FloatingActionButtons({
       return;
     }
 
-    const payload = buildTechReviewReplyPayload(
-      data,
-      checklistFormState,
-      "KECO",
-      "TE",
-      "SV",
-      getReviewOpinionFormData(),
-      opnrNm,
-    );
+    const payload = {
+      ...buildTechReviewReplyPayload(
+        data,
+        checklistFormState,
+        "KECO",
+        "TE",
+        "SV",
+        getReviewOpinionFormData(),
+        opnrNm,
+      ),
+      splmntDmndList: (data.splmntDmndList ?? []).map(toSplmntDmndSaveItem),
+    };
 
     await executeAction({
       action: FNRS_CNSLTN_VIEW_BUTTON_ACTION.rvwCmptn,
@@ -439,11 +433,6 @@ function FloatingActionButtons({
               삭제
             </Button>
           )}
-          {shouldShowButton(FNRS_CNSLTN_VIEW_BUTTON_ACTION.splmntCmptn) && (
-            <Button onClick={handleSplmntCmptnClick} disabled={isProcessing}>
-              보완완료
-            </Button>
-          )}
           {shouldShowButton(FNRS_CNSLTN_VIEW_BUTTON_ACTION.fnrsCnsltnAncmnt) && (
             <Button onClick={handleFnrsCnsltnAncmntClick} disabled={isProcessing}>
               재원협의 고시
@@ -518,7 +507,7 @@ function FloatingActionButtons({
         open={activeDialog === "dmndSplmnt"}
         onOpenChange={() => setActiveDialog(null)}
         isSubmitting={isProcessing}
-        onConfirm={(payload) => void handleDmndSplmntConfirm(payload)}
+        onConfirm={handleDmndSplmntConfirm}
       />
 
       <ElaprApprovalDialog
@@ -558,19 +547,6 @@ async function handleDel(context: ActionHandlerContext): Promise<void> {
   }
 }
 
-async function handleSplmntCmptn(
-  context: ActionHandlerContext<FnrsCnsltnApplySaveRequestDto>,
-): Promise<void> {
-  try {
-    const docNo = context.data.detDto?.fnrsCnsltnDocNo;
-    if (!docNo) throw new Error("문서번호가 없습니다.");
-    await fnrsCnsltnMngService.submitSupplement(docNo, context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
 async function handleChangePrgrsSttsComCd(
   context: ActionHandlerContext<DocPrgrsUpdateRequestDto>,
 ): Promise<void> {
@@ -634,7 +610,6 @@ const buttonActionHandlers: Record<FnrsCnsltnViewButtonAction, ActionHandler> =
   strg: handleSaveApply,
   aply: handleSaveApply,
   del: handleDel,
-  splmntCmptn: handleSplmntCmptn,
   fnrsCnsltnAncmnt: handleChangePrgrsSttsComCd,
   envoSbmsn: handleChangePrgrsSttsComCd,
   rjct: handleChangePrgrsSttsComCd,
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-form-page.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-form-page.tsx
index ddcd2074f..76c42f38f 100644
--- a/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-form-page.tsx
+++ b/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-form-page.tsx
@@ -11,6 +11,7 @@ import { useQueryClient } from "@tanstack/react-query";
 import { useAlertStore, useUserStore } from "@/shared/lib";
 import { useAcntgSeMngTree } from "@/entities/acntg";
 import {
+  type FnrsCnsltnApplySaveRequestDto,
   fnrsCnsltnMngBaseKey,
   type FnrsCnsltnMngDetResponseDto,
   fnrsCnsltnMngService,
@@ -28,6 +29,7 @@ import {
   isFormChecklistComplete,
   PrivacyConsentSection,
   recalculateFnrsSharTotals,
+  SplmntDmndFormSection,
   toFnrsSharSaveList,
   validateBizCstSharBalance,
 } from "@/widgets/pbadms-sprt";
@@ -56,6 +58,7 @@ function FnrsFormPage({ id, mode, initialData, taskSeComCd }: FnrsFormPageProps)
   const alert = useAlertStore((state) => state.setMessage);
   const [isSubmitting, setIsSubmitting] = useState(false);
   const isEditMode = mode === "edit";
+  const isSplmntPrgrsStts = initialData?.detDto?.prgrsSttsComCd === "SL";
 
   const { data: masterSharTree = [] } = useFnrsSharSeMngTree();
   const { data: acntgTree = [] } = useAcntgSeMngTree();
@@ -73,10 +76,10 @@ function FnrsFormPage({ id, mode, initialData, taskSeComCd }: FnrsFormPageProps)
         : getCreateDefaultValues(userInfo, taskSeComCd),
   });
 
-  async function submitForm(
+  function buildFormPayload(
     data: FnrsCnsltnRegistFormData,
-    prgrsSttsComCd: "SV" | "ST",
-  ): Promise<string | undefined> {
+    prgrsSttsComCd: "SV" | "ST" | "TE",
+  ): FnrsCnsltnApplySaveRequestDto | undefined {
     const withTotals = recalculateFnrsSharTotals(data.fnrsSharList, sharItems);
     const validationMessage = validateBizCstSharBalance(
       data.bizCstList,
@@ -86,12 +89,12 @@ function FnrsFormPage({ id, mode, initialData, taskSeComCd }: FnrsFormPageProps)
     );
     if (validationMessage) {
       alert(validationMessage);
-      return;
+      return undefined;
     }
 
     const { taskSeComCd: formTaskSeComCd, ...fnrsCnsltnMngRest } = data.fnrsCnsltnMng;
 
-    const payload = {
+    return {
       fnrsCnsltnMng: {
         ...fnrsCnsltnMngRest,
         taskSeComCd: formatTaskSeComCdForApi(formTaskSeComCd),
@@ -106,11 +109,71 @@ function FnrsFormPage({ id, mode, initialData, taskSeComCd }: FnrsFormPageProps)
         selected: item.selected ?? undefined,
       })),
       esntlAtchFileList: data.esntlAtchFileList,
+      splmntDmndList: data.splmntDmndList.map(
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        ({ splmntAtchFileNm, splmntAtchFileAtflId, splmntDmndAtchFileNm, ...item }) => ({
+          ...item,
+          ...(prgrsSttsComCd === "TE" ? { cmptnYn: "Y" } : null),
+        }),
+      ),
     };
+  }
 
+  async function submitForm(
+    data: FnrsCnsltnRegistFormData,
+    prgrsSttsComCd: "SV" | "ST",
+  ): Promise<string | undefined> {
+    const payload = buildFormPayload(data, prgrsSttsComCd);
+    if (!payload) return undefined;
     return fnrsCnsltnMngService.saveApply(payload);
   }
 
+  async function submitSupplementForm(data: FnrsCnsltnRegistFormData): Promise<string | undefined> {
+    const docNo = initialData?.detDto?.fnrsCnsltnDocNo;
+    if (!docNo) return undefined;
+
+    const payload = buildFormPayload(data, "TE");
+    if (!payload) return undefined;
+
+    return fnrsCnsltnMngService.submitSupplement(docNo, payload);
+  }
+
+  async function onSplmntCmptn(data: FnrsCnsltnRegistFormData) {
+    if (isSubmitting) return;
+
+    const hasEmptySplmntCn = data.splmntDmndList?.some(
+      (item) => !item.splmntCn || !item.splmntCn.trim(),
+    );
+    if (hasEmptySplmntCn) {
+      alert("보완요청내용이 있습니다. 보완완료내용을 입력해 주세요.");
+      return;
+    }
+
+    const docNo = initialData?.detDto?.fnrsCnsltnDocNo;
+    if (!docNo) {
+      alert("문서번호가 없습니다.");
+      return;
+    }
+
+    try {
+      setIsSubmitting(true);
+      const result = await submitSupplementForm(data);
+      if (!result) return;
+
+      alert("보완완료 처리되었습니다.");
+      router.push(`/fnrs-cnsltn/${docNo}`);
+      queryClient.invalidateQueries({ queryKey: fnrsCnsltnMngBaseKey });
+      queryClient.invalidateQueries({
+        queryKey: [...fnrsCnsltnMngBaseKey, "findById", docNo],
+      });
+    } catch (error) {
+      console.error("보완완료 실패:", error);
+      alert("보완완료 처리 중 오류가 발생했습니다.");
+    } finally {
+      setIsSubmitting(false);
+    }
+  }
+
   async function onSave(data: FnrsCnsltnRegistFormData) {
     if (isSubmitting) return;
 
@@ -210,6 +273,7 @@ function FnrsFormPage({ id, mode, initialData, taskSeComCd }: FnrsFormPageProps)
           initialEsntlFiles={isEditMode ? initialData?.esntlFileList : undefined}
           initialEtcFiles={isEditMode ? initialData?.etcFileList : undefined}
         />
+        <SplmntDmndFormSection readOnly={!isSplmntPrgrsStts} />
 
         <div className="sticky bottom-0 z-40 !-mb-2 border-t bg-white pb-8 pt-6 shadow-[0_-4px_12px_rgba(0,0,0,0.06)]">
           <div className="mx-4 flex flex-wrap justify-center gap-3 sm:gap-4">
@@ -221,23 +285,40 @@ function FnrsFormPage({ id, mode, initialData, taskSeComCd }: FnrsFormPageProps)
             >
               목록
             </Button>
-            <Button type="submit" disabled={isSubmitting}>
-              저장
-            </Button>
-            {isEditMode && (
+            {!isSplmntPrgrsStts ? (
               <>
-                <Button
-                  color="green"
-                  type="button"
-                  onClick={handleApplyClick}
-                  disabled={isSubmitting}
-                >
-                  신청완료
-                </Button>
-                <Button color="red" type="button" onClick={handleDelClick} disabled={isSubmitting}>
-                  삭제
+                <Button type="submit" disabled={isSubmitting}>
+                  저장
                 </Button>
+                {isEditMode && (
+                  <>
+                    <Button
+                      color="green"
+                      type="button"
+                      onClick={handleApplyClick}
+                      disabled={isSubmitting}
+                    >
+                      신청완료
+                    </Button>
+                    <Button
+                      color="red"
+                      type="button"
+                      onClick={handleDelClick}
+                      disabled={isSubmitting}
+                    >
+                      삭제
+                    </Button>
+                  </>
+                )}
               </>
+            ) : (
+              <Button
+                type="button"
+                onClick={form.handleSubmit(onSplmntCmptn)}
+                disabled={isSubmitting}
+              >
+                보완완료
+              </Button>
             )}
           </div>
         </div>
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-view-page.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-view-page.tsx
index d4f110f0a..2423e1ead 100644
--- a/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-view-page.tsx
+++ b/apps/as/src/pages/fnrs-cnsltn/ui/fnrs-view-page.tsx
@@ -5,7 +5,7 @@ import { useRef } from "react";
 import { useUserStore } from "@/shared/lib";
 import { ElaprDocPrgrsStatus } from "@/entities/elapr";
 import { useFnrsCnsltnMng } from "@/entities/fnrs-cnsltn";
-import { SectionCollapsible } from "@/widgets/pbadms-sprt";
+import { SectionCollapsible, SupplementDemandSection } from "@/widgets/pbadms-sprt";
 import { Skeleton } from "@common/components";
 
 import { getEditableReviewStep } from "../lib/review-step-utils";
@@ -19,7 +19,6 @@ import { BusinessScaleSection } from "./sections/business-scale-section";
 import { ChecklistSection } from "./sections/checklist-section";
 import { ContactInfoSection } from "./sections/contact-info-section";
 import { FnrsSharSection } from "./sections/fnrs-shar-section";
-import { SupplementDemandSection } from "./sections/supplement-demand-section";
 import {
   TechReviewOpinionSection,
   type TechReviewOpinionSectionHandle,
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/sections/supplement-demand-section.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/sections/supplement-demand-section.tsx
deleted file mode 100644
index 339b803b1..000000000
--- a/apps/as/src/pages/fnrs-cnsltn/ui/sections/supplement-demand-section.tsx
+++ /dev/null
@@ -1,57 +0,0 @@
-"use client";
-
-import { dayjs } from "@/shared/lib";
-import type { FnrsCnsltnSplmntDmndResponseDto } from "@/entities/fnrs-cnsltn";
-import { SectionCollapsible } from "@/widgets/pbadms-sprt";
-import {
-  Badge,
-  Table,
-  TableBody,
-  TableCell,
-  TableHead,
-  TableHeader,
-  TableRow,
-} from "@common/components";
-
-interface SupplementDemandSectionProps {
-  splmntDmndList: FnrsCnsltnSplmntDmndResponseDto[];
-}
-
-function SupplementDemandSection({ splmntDmndList }: SupplementDemandSectionProps) {
-  if (splmntDmndList.length === 0) return null;
-
-  return (
-    <SectionCollapsible title="보완요청">
-      <Table variant="secondary">
-        <TableHeader>
-          <TableRow>
-            <TableHead className="w-[8rem]">항목</TableHead>
-            <TableHead>보완요청 내용</TableHead>
-            <TableHead>보완 내용</TableHead>
-            <TableHead className="w-[8rem]">완료여부</TableHead>
-            <TableHead className="w-[12rem]">요청일시</TableHead>
-          </TableRow>
-        </TableHeader>
-        <TableBody>
-          {splmntDmndList.map((item) => (
-            <TableRow key={item.splmntDmndSn}>
-              <TableCell>{item.splmntArtclCdNm || "-"}</TableCell>
-              <TableCell className="whitespace-pre-wrap">{item.splmntDmndCn || "-"}</TableCell>
-              <TableCell className="whitespace-pre-wrap">{item.splmntCn || "-"}</TableCell>
-              <TableCell>
-                <Badge color={item.cmptnYn === "Y" ? "green" : "gray"}>
-                  {item.cmptnYn === "Y" ? "완료" : "미완료"}
-                </Badge>
-              </TableCell>
-              <TableCell>
-                {item.splmntDmndDt ? dayjs(item.splmntDmndDt).format("YYYY-MM-DD HH:mm") : "-"}
-              </TableCell>
-            </TableRow>
-          ))}
-        </TableBody>
-      </Table>
-    </SectionCollapsible>
-  );
-}
-
-export { SupplementDemandSection };
diff --git a/apps/as/src/pages/instl-sncn/lib/button-config.ts b/apps/as/src/pages/instl-sncn/lib/button-config.ts
index 28ce89f9e..8dafefd31 100644
--- a/apps/as/src/pages/instl-sncn/lib/button-config.ts
+++ b/apps/as/src/pages/instl-sncn/lib/button-config.ts
@@ -2,7 +2,6 @@ export const INSTL_SNCN_VIEW_BUTTON_ACTION = {
   strg: "strg",
   aply: "aply",
   del: "del",
-  splmntCmptn: "splmntCmptn",
   instlSncnAncmnt: "instlSncnAncmnt",
   envoSbmsn: "envoSbmsn",
   rjct: "rjct",
@@ -32,7 +31,6 @@ const ROLE_STATUS_BUTTON_ACTIONS: Record<string, Record<string, InstlSncnViewBut
       INSTL_SNCN_VIEW_BUTTON_ACTION.aply,
       INSTL_SNCN_VIEW_BUTTON_ACTION.del,
     ],
-    SL: [INSTL_SNCN_VIEW_BUTTON_ACTION.splmntCmptn],
     TA: [INSTL_SNCN_VIEW_BUTTON_ACTION.instlSncnAncmnt],
   },
   ROLE_USER04: {
diff --git a/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx b/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx
index 0f36c1ee6..982921997 100644
--- a/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/components/floating-action-buttons.tsx
@@ -44,7 +44,6 @@ import {
   toSplmntDmndSaveItem,
 } from "../../lib/save-payload-utils";
 import { type ChecklistFormState } from "../../model/view-types";
-import type { SupplementDemandSectionHandle } from "../sections/supplement-demand-section";
 import type { TechReviewOpinionSectionHandle } from "../sections/tech-review-opinion-section";
 
 interface FloatingActionButtonsProps {
@@ -55,7 +54,6 @@ interface FloatingActionButtonsProps {
   dtlInstCd: string | undefined;
   checklistFormState: ChecklistFormState;
   techReviewOpinionRef?: React.RefObject<TechReviewOpinionSectionHandle | null>;
-  supplementDemandRef?: React.RefObject<SupplementDemandSectionHandle | null>;
   opnrNm?: string;
 }
 
@@ -69,7 +67,6 @@ function FloatingActionButtons({
   dtlInstCd,
   checklistFormState,
   techReviewOpinionRef,
-  supplementDemandRef,
   opnrNm,
 }: FloatingActionButtonsProps) {
   const router = useRouter();
@@ -397,9 +394,7 @@ function FloatingActionButtons({
         getReviewOpinionFormData(),
         opnrNm,
       ),
-      splmntDmndList:
-        supplementDemandRef?.current?.getSplmntDmndList() ??
-        (data.splmntDmndList ?? []).map(toSplmntDmndSaveItem),
+      splmntDmndList: (data.splmntDmndList ?? []).map(toSplmntDmndSaveItem),
     };
 
     await executeAction({
@@ -451,16 +446,6 @@ function FloatingActionButtons({
               삭제
             </Button>
           )}
-          {shouldShowButton(INSTL_SNCN_VIEW_BUTTON_ACTION.splmntCmptn) && (
-            <Button
-              onClick={() =>
-                void executeAction({ action: INSTL_SNCN_VIEW_BUTTON_ACTION.splmntCmptn })
-              }
-              disabled={isProcessing}
-            >
-              보완완료
-            </Button>
-          )}
           {shouldShowButton(INSTL_SNCN_VIEW_BUTTON_ACTION.instlSncnAncmnt) && (
             <Button onClick={handleInstlSncnAncmntClick} disabled={isProcessing}>
               설치인가 고시
@@ -575,19 +560,6 @@ async function handleDel(context: ActionHandlerContext): Promise<void> {
   }
 }
 
-async function handleSplmntCmptn(
-  context: ActionHandlerContext<InstlSncnApplySaveRequestDto>,
-): Promise<void> {
-  try {
-    const docNo = context.data.detDto?.instlSncnDocNo;
-    if (!docNo) throw new Error("문서번호가 없습니다.");
-    await instlSncnService.submitSupplement(docNo, context.request);
-    context.onSuccess?.();
-  } catch (error) {
-    context.onError?.(error as Error);
-  }
-}
-
 async function handleChangePrgrsSttsComCd(
   context: ActionHandlerContext<DocPrgrsUpdateRequestDto>,
 ): Promise<void> {
@@ -648,7 +620,6 @@ const buttonActionHandlers: Record<InstlSncnViewButtonAction, ActionHandler> = {
   strg: handleSaveApply,
   aply: handleSaveApply,
   del: handleDel,
-  splmntCmptn: handleSplmntCmptn,
   instlSncnAncmnt: handleChangePrgrsSttsComCd,
   envoSbmsn: handleChangePrgrsSttsComCd,
   rjct: handleChangePrgrsSttsComCd,
diff --git a/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx b/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx
index 2b0e1fe1b..6cfd0f488 100644
--- a/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx
@@ -83,7 +83,10 @@ function InstlFormPage({ id, mode, initialData, taskSeComCd }: InstlFormPageProp
       esntlAtchFileList: data.esntlAtchFileList,
       splmntDmndList: data.splmntDmndList.map(
         // eslint-disable-next-line @typescript-eslint/no-unused-vars
-        ({ splmntAtchFileNm, splmntAtchFileAtflId, splmntDmndAtchFileNm, ...item }) => item,
+        ({ splmntAtchFileNm, splmntAtchFileAtflId, splmntDmndAtchFileNm, ...item }) => ({
+          ...item,
+          ...(prgrsSttsComCd === "TE" ? { cmptnYn: "Y" } : null),
+        }),
       ),
     };
   }
@@ -104,6 +107,14 @@ function InstlFormPage({ id, mode, initialData, taskSeComCd }: InstlFormPageProp
   async function onSplmntCmptn(data: InstlSncnRegistFormData) {
     if (isSubmitting) return;
 
+    const hasEmptySplmntCn = data.splmntDmndList?.some(
+      (item) => !item.splmntCn || !item.splmntCn.trim(),
+    );
+    if (hasEmptySplmntCn) {
+      alert("보완요청내용이 있습니다. 보완완료내용을 입력해 주세요.");
+      return;
+    }
+
     const docNo = initialData?.detDto.instlSncnDocNo;
     if (!docNo) {
       alert("문서번호가 없습니다.");
diff --git a/apps/as/src/pages/instl-sncn/ui/instl-view-page.tsx b/apps/as/src/pages/instl-sncn/ui/instl-view-page.tsx
index bee427e3f..c5904ebae 100644
--- a/apps/as/src/pages/instl-sncn/ui/instl-view-page.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/instl-view-page.tsx
@@ -5,7 +5,7 @@ import { useRef } from "react";
 import { useUserStore } from "@/shared/lib";
 import { ElaprDocPrgrsStatus } from "@/entities/elapr";
 import { useInstlSncnDetail } from "@/entities/instl-sncn";
-import { SectionCollapsible } from "@/widgets/pbadms-sprt";
+import { SectionCollapsible, SupplementDemandSection } from "@/widgets/pbadms-sprt";
 import { Skeleton } from "@common/components";
 
 import { getEditableReviewStep } from "../lib/review-step-utils";
@@ -18,10 +18,6 @@ import { BusinessCostSection } from "./sections/business-cost-section";
 import { BusinessScaleSection } from "./sections/business-scale-section";
 import { ChecklistSection } from "./sections/checklist-section";
 import { ContactInfoSection } from "./sections/contact-info-section";
-import {
-  SupplementDemandSection,
-  type SupplementDemandSectionHandle,
-} from "./sections/supplement-demand-section";
 import {
   TechReviewOpinionSection,
   type TechReviewOpinionSectionHandle,
@@ -34,7 +30,6 @@ interface InstlViewPageProps {
 function InstlViewPage({ id }: InstlViewPageProps) {
   const userInfo = useUserStore((state) => state.userInfo);
   const techReviewOpinionRef = useRef<TechReviewOpinionSectionHandle>(null);
-  const supplementDemandRef = useRef<SupplementDemandSectionHandle>(null);
   const { data, isLoading, isError } = useInstlSncnDetail(id);
   const { formState: checklistFormState, setFormState: setChecklistFormState } =
     useChecklistFormState(data?.cklstResultList ?? EMPTY_CKLST_RESULT_LIST);
@@ -100,11 +95,7 @@ function InstlViewPage({ id }: InstlViewPageProps) {
         rvwList={rvwList}
         editableReviewStep={editableReviewStep}
       />
-      <SupplementDemandSection
-        ref={supplementDemandRef}
-        splmntDmndList={splmntDmndList}
-        canEditCmptnYn={userInfo?.dtlInstCd === "ROLE_USER01"}
-      />
+      <SupplementDemandSection splmntDmndList={splmntDmndList} />
       <FloatingActionButtons
         data={data}
         docSeComCd="INSTL"
@@ -113,7 +104,6 @@ function InstlViewPage({ id }: InstlViewPageProps) {
         dtlInstCd={userInfo?.dtlInstCd}
         checklistFormState={checklistFormState}
         techReviewOpinionRef={techReviewOpinionRef}
-        supplementDemandRef={supplementDemandRef}
         opnrNm={userInfo?.userName}
       />
     </div>
diff --git a/apps/as/src/widgets/pbadms-sprt/index.ts b/apps/as/src/widgets/pbadms-sprt/index.ts
index 550a07dd5..caab6fba0 100644
--- a/apps/as/src/widgets/pbadms-sprt/index.ts
+++ b/apps/as/src/widgets/pbadms-sprt/index.ts
@@ -36,4 +36,5 @@ export {
   type SplmntDmndDialogConfirmPayload,
 } from "./ui/splmnt-dmnd-dialog";
 export { type SplmntDmndFormItem, SplmntDmndFormSection } from "./ui/splmnt-dmnd-form-section";
+export { SupplementDemandSection } from "./ui/supplement-demand-section";
 export { TaskSePickerDialog } from "./ui/task-se-picker-dialog";
diff --git a/apps/as/src/pages/instl-sncn/ui/sections/supplement-demand-section.tsx b/apps/as/src/widgets/pbadms-sprt/ui/supplement-demand-section.tsx
similarity index 53%
rename from apps/as/src/pages/instl-sncn/ui/sections/supplement-demand-section.tsx
rename to apps/as/src/widgets/pbadms-sprt/ui/supplement-demand-section.tsx
index 319c79815..c4637fd4e 100644
--- a/apps/as/src/pages/instl-sncn/ui/sections/supplement-demand-section.tsx
+++ b/apps/as/src/widgets/pbadms-sprt/ui/supplement-demand-section.tsx
@@ -1,181 +1,114 @@
-"use client";
-
-import { forwardRef, useImperativeHandle, useState } from "react";
-
-import { Paperclip } from "lucide-react";
-
-import { dayjs } from "@/shared/lib";
-import { Field, FieldLabel, FieldSet } from "@/shared/ui/field";
-import { useDownloadAttachmentByAtflCd } from "@/entities/attach";
-import type {
-  InstlSncnSplmntDmndResponseDto,
-  InstlSncnSplmntDmndSaveDto,
-} from "@/entities/instl-sncn";
-import { SectionCollapsible } from "@/widgets/pbadms-sprt";
-import {
-  Badge,
-  RadioGroup,
-  RadioGroupItem,
-  Table,
-  TableBody,
-  TableCell,
-  TableHead,
-  TableHeader,
-  TableRow,
-} from "@common/components";
-
-import { toSplmntDmndSaveItem } from "../../lib/save-payload-utils";
-
-interface SupplementDemandSectionProps {
-  splmntDmndList: InstlSncnSplmntDmndResponseDto[];
-  canEditCmptnYn: boolean;
-}
-
-export interface SupplementDemandSectionHandle {
-  getSplmntDmndList: () => InstlSncnSplmntDmndSaveDto[];
-}
-
-const SupplementDemandSection = forwardRef<
-  SupplementDemandSectionHandle,
-  SupplementDemandSectionProps
->(function SupplementDemandSection({ splmntDmndList, canEditCmptnYn }, ref) {
-  const [cmptnYnBySn, setCmptnYnBySn] = useState<Record<number, string>>({});
-  const { mutate: downloadAttachment } = useDownloadAttachmentByAtflCd();
-
-  useImperativeHandle(
-    ref,
-    () => ({
-      getSplmntDmndList: () =>
-        splmntDmndList.map((item) => {
-          const saveItem = toSplmntDmndSaveItem(item);
-          const sn = item.splmntDmndSn;
-          if (sn == null || cmptnYnBySn[sn] == null) return saveItem;
-          return { ...saveItem, cmptnYn: cmptnYnBySn[sn] };
-        }),
-    }),
-    [splmntDmndList, cmptnYnBySn],
-  );
-
-  function getCmptnYn(item: InstlSncnSplmntDmndResponseDto) {
-    const sn = item.splmntDmndSn;
-    if (sn != null && cmptnYnBySn[sn] != null) return cmptnYnBySn[sn];
-    return item.cmptnYn ?? "N";
-  }
-
-  return (
-    <SectionCollapsible title="보완요청 및 완료 현황">
-      <div className="overflow-x-auto">
-        <Table variant="secondary">
-          <colgroup>
-            <col width="14%" />
-            <col width="8%" />
-            <col width="30%" />
-            <col width="8%" />
-            <col width="30%" />
-            <col width="10%" />
-          </colgroup>
-          <TableHeader>
-            <TableRow>
-              <TableHead>보완항목</TableHead>
-              <TableHead>보완요청일시</TableHead>
-              <TableHead>보완요청내용</TableHead>
-              <TableHead>보완완료일시</TableHead>
-              <TableHead>보완완료내용</TableHead>
-              <TableHead>완료여부</TableHead>
-            </TableRow>
-          </TableHeader>
-          <TableBody>
-            {splmntDmndList.map((item) => {
-              const sn = item.splmntDmndSn;
-              const cmptnYn = getCmptnYn(item);
-              const dmndAtchFileNm = item.splmntDmndAtchFileInfo?.orgnlFileNm;
-              const cmptnAtchFileNm = item.splmntAtchFileInfo?.orgnlFileNm;
-
-              return (
-                <TableRow key={sn ?? `${item.splmntArtclComCd}-${item.splmntDmndDt}`}>
-                  <TableCell align="center" className="align-top">
-                    {item.splmntArtclCdNm || "-"}
-                  </TableCell>
-                  <TableCell align="center" className="whitespace-nowrap align-top">
-                    {item.splmntDmndDt ? dayjs(item.splmntDmndDt).format("YYYY-MM-DD HH:mm") : "-"}
-                  </TableCell>
-                  <TableCell className="align-top">
-                    <div className="space-y-2">
-                      <div className="whitespace-pre-wrap">{item.splmntDmndCn || "-"}</div>
-                      {item.splmntDmndAtchFileGroupId ? (
-                        <a
-                          className="inline-flex cursor-pointer items-start gap-1 text-blue-600 hover:underline"
-                          onClick={() => downloadAttachment(item.splmntDmndAtchFileGroupId!)}
-                        >
-                          <Paperclip className="my-1 size-5 shrink-0" />
-                          {dmndAtchFileNm || "다운로드"}
-                        </a>
-                      ) : null}
-                    </div>
-                  </TableCell>
-                  <TableCell align="center" className="whitespace-nowrap align-top">
-                    {item.splmntCmptnDt
-                      ? dayjs(item.splmntCmptnDt).format("YYYY-MM-DD HH:mm")
-                      : "-"}
-                  </TableCell>
-                  <TableCell className="align-top">
-                    <div className="space-y-2">
-                      <div className="whitespace-pre-wrap">{item.splmntCn || "-"}</div>
-                      {item.splmntAtchFileGroupId ? (
-                        <a
-                          className="inline-flex cursor-pointer items-start gap-1 text-blue-600 hover:underline"
-                          onClick={() => downloadAttachment(item.splmntAtchFileGroupId!)}
-                        >
-                          <Paperclip className="my-1 size-5 shrink-0" />
-                          {cmptnAtchFileNm || "다운로드"}
-                        </a>
-                      ) : null}
-                    </div>
-                  </TableCell>
-                  <TableCell align="center" className="align-top">
-                    {canEditCmptnYn && sn != null ? (
-                      <FieldSet>
-                        <RadioGroup
-                          value={cmptnYn}
-                          onValueChange={(value) =>
-                            setCmptnYnBySn((prev) => ({ ...prev, [sn]: value }))
-                          }
-                          className="flex justify-center gap-4"
-                        >
-                          <FieldLabel
-                            htmlFor={`splmnt-cmptn-y-${sn}`}
-                            className="!w-auto border-none"
-                          >
-                            <Field orientation="horizontal" className="w-auto">
-                              <RadioGroupItem value="Y" id={`splmnt-cmptn-y-${sn}`} />
-                              <span className="font-normal">완료</span>
-                            </Field>
-                          </FieldLabel>
-                          <FieldLabel
-                            htmlFor={`splmnt-cmptn-n-${sn}`}
-                            className="!w-auto border-none"
-                          >
-                            <Field orientation="horizontal" className="w-auto">
-                              <RadioGroupItem value="N" id={`splmnt-cmptn-n-${sn}`} />
-                              <span className="font-normal">미완료</span>
-                            </Field>
-                          </FieldLabel>
-                        </RadioGroup>
-                      </FieldSet>
-                    ) : (
-                      <Badge size="lg" color={cmptnYn === "Y" ? "green" : "gray"}>
-                        {cmptnYn === "Y" ? "완료" : "미완료"}
-                      </Badge>
-                    )}
-                  </TableCell>
-                </TableRow>
-              );
-            })}
-          </TableBody>
-        </Table>
-      </div>
-    </SectionCollapsible>
-  );
-});
-
-export { SupplementDemandSection };
+"use client";
+
+import { Paperclip } from "lucide-react";
+
+import { dayjs } from "@/shared/lib";
+import type { SplmntDmndResponseExtension, SplmntDmndSaveBase } from "@/shared/model";
+import { useDownloadAttachmentByAtflCd } from "@/entities/attach";
+import {
+  Badge,
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableHeader,
+  TableRow,
+} from "@common/components";
+
+import { SectionCollapsible } from "./section-collapsible";
+
+type SplmntDmndItem = SplmntDmndSaveBase & SplmntDmndResponseExtension;
+
+interface SupplementDemandSectionProps {
+  splmntDmndList: SplmntDmndItem[];
+}
+
+function SupplementDemandSection({ splmntDmndList }: SupplementDemandSectionProps) {
+  const { mutate: downloadAttachment } = useDownloadAttachmentByAtflCd();
+
+  return (
+    <SectionCollapsible title="보완요청 및 완료 현황">
+      <div className="overflow-x-auto">
+        <Table variant="secondary">
+          <colgroup>
+            <col width="14%" />
+            <col width="8%" />
+            <col width="30%" />
+            <col width="8%" />
+            <col width="30%" />
+            <col width="10%" />
+          </colgroup>
+          <TableHeader>
+            <TableRow>
+              <TableHead>보완항목</TableHead>
+              <TableHead>보완요청일시</TableHead>
+              <TableHead>보완요청내용</TableHead>
+              <TableHead>보완완료일시</TableHead>
+              <TableHead>보완완료내용</TableHead>
+              <TableHead>완료여부</TableHead>
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {splmntDmndList.map((item) => {
+              const sn = item.splmntDmndSn;
+              const cmptnYn = item.cmptnYn ?? "N";
+              const dmndAtchFileNm = item.splmntDmndAtchFileInfo?.orgnlFileNm;
+              const cmptnAtchFileNm = item.splmntAtchFileInfo?.orgnlFileNm;
+
+              return (
+                <TableRow key={sn ?? `${item.splmntArtclComCd}-${item.splmntDmndDt}`}>
+                  <TableCell align="center" className="align-top">
+                    {item.splmntArtclCdNm || "-"}
+                  </TableCell>
+                  <TableCell align="center" className="whitespace-nowrap align-top">
+                    {item.splmntDmndDt ? dayjs(item.splmntDmndDt).format("YYYY-MM-DD HH:mm") : "-"}
+                  </TableCell>
+                  <TableCell className="align-top">
+                    <div className="space-y-2">
+                      <div className="whitespace-pre-wrap">{item.splmntDmndCn || "-"}</div>
+                      {item.splmntDmndAtchFileGroupId ? (
+                        <a
+                          className="inline-flex cursor-pointer items-start gap-1 text-blue-600 hover:underline"
+                          onClick={() => downloadAttachment(item.splmntDmndAtchFileGroupId!)}
+                        >
+                          <Paperclip className="my-1 size-5 shrink-0" />
+                          {dmndAtchFileNm || "다운로드"}
+                        </a>
+                      ) : null}
+                    </div>
+                  </TableCell>
+                  <TableCell align="center" className="whitespace-nowrap align-top">
+                    {item.splmntCmptnDt
+                      ? dayjs(item.splmntCmptnDt).format("YYYY-MM-DD HH:mm")
+                      : "-"}
+                  </TableCell>
+                  <TableCell className="align-top">
+                    <div className="space-y-2">
+                      <div className="whitespace-pre-wrap">{item.splmntCn || "-"}</div>
+                      {item.splmntAtchFileGroupId ? (
+                        <a
+                          className="inline-flex cursor-pointer items-start gap-1 text-blue-600 hover:underline"
+                          onClick={() => downloadAttachment(item.splmntAtchFileGroupId!)}
+                        >
+                          <Paperclip className="my-1 size-5 shrink-0" />
+                          {cmptnAtchFileNm || "다운로드"}
+                        </a>
+                      ) : null}
+                    </div>
+                  </TableCell>
+                  <TableCell align="center" className="align-top">
+                    <Badge size="lg" color={cmptnYn === "Y" ? "green" : "gray"}>
+                      {cmptnYn === "Y" ? "완료" : "미완료"}
+                    </Badge>
+                  </TableCell>
+                </TableRow>
+              );
+            })}
+          </TableBody>
+        </Table>
+      </div>
+    </SectionCollapsible>
+  );
+}
+
+export { SupplementDemandSection };