diff --git a/apps/dm_new/app/(landing)/reuse/apply/modal/CandidateSiteModal.tsx b/apps/dm_new/app/(landing)/reuse/apply/modal/CandidateSiteModal.tsx
new file mode 100644
index 000000000..aa5a9c0ee
--- /dev/null
+++ b/apps/dm_new/app/(landing)/reuse/apply/modal/CandidateSiteModal.tsx
@@ -0,0 +1,327 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+
+export type CandidateSite = {
+  id: string;
+  name: string;
+  sewageM3d: number; // 하수처리량
+  reuseM3d: number; // 재이용량
+  // 지도 연동 시 사용(현재는 UI/구조용)
+  lat?: number;
+  lng?: number;
+};
+
+type Props = {
+  open: boolean;
+  onClose: () => void;
+  onApply: (selected: CandidateSite[]) => void;
+  initialSelected?: CandidateSite[];
+  maxSelect?: number; // 기본 3개
+};
+
+const MOCK_SITES: CandidateSite[] = [
+  { id: "1", name: "서호생태 수자원 재이용1", sewageM3d: 1300, reuseM3d: 1300, lat: 35.0, lng: 128.0 },
+  { id: "2", name: "서호생태 수자원 재이용2", sewageM3d: 1300, reuseM3d: 1300, lat: 35.01, lng: 128.01 },
+  { id: "3", name: "서호생태 수자원 재이용3", sewageM3d: 1300, reuseM3d: 1300, lat: 35.02, lng: 128.02 },
+];
+
+export default function CandidateSiteModal({
+  open,
+  onClose,
+  onApply,
+  initialSelected = [],
+  maxSelect = 3,
+}: Props) {
+  const [q, setQ] = useState("");
+  const [selected, setSelected] = useState<CandidateSite[]>(initialSelected);
+
+    // 지도 마커 컴포넌트
+    function MapMarker({ label }: { label?: string }) {
+    return (
+        <div className="relative -translate-x-1/2 -translate-y-full">
+            <svg width="72" height="66" viewBox="0 0 72 92">
+                <defs>
+                <linearGradient id="pinGrad" x1="0" y1="0" x2="0" y2="1">
+                    <stop offset="0%" stopColor="#2EDAA0" />
+                    <stop offset="100%" stopColor="#02A7D8" />
+                </linearGradient>
+
+                <filter id="pinShadow" x="-50%" y="-50%" width="200%" height="200%">
+                    <feDropShadow dx="0" dy="2" stdDeviation="2" floodColor="#000" floodOpacity="0.18" />
+                </filter>
+                </defs>
+
+                {/* pin body */}
+                <path
+                    filter="url(#pinShadow)"
+                    d="M36 2C21 2 9 14 9 29c0 22 24 50 26.4 52.7a2 2 0 0 0 3.2 0C40.9 79 63 51 63 29 63 14 51 2 36 2z"
+                    fill="url(#pinGrad)"
+                />
+
+                {/* 내부 흰 원 */}
+                <circle cx="36" cy="29" r="20" fill="#FFFFFF" />
+
+                {label && (
+                <text
+                    x="36"
+                    y="36"
+                    textAnchor="middle"
+                    fontSize="18"
+                    fontWeight="700"
+                    fill="#1F2937"
+                >
+                    {label}
+                </text>
+                )}
+            </svg>
+        </div>
+    );
+  }
+
+  // 모달 열릴 때마다 초기 선택값 동기화
+  useEffect(() => {
+    if (open) setSelected(initialSelected);
+    if (open) setQ("");
+  }, [open, initialSelected]);
+
+  // ESC 닫기
+  useEffect(() => {
+    if (!open) return;
+    const onKeyDown = (e: KeyboardEvent) => {
+      if (e.key === "Escape") onClose();
+    };
+    window.addEventListener("keydown", onKeyDown);
+    return () => window.removeEventListener("keydown", onKeyDown);
+  }, [open, onClose]);
+
+  const filtered = useMemo(() => {
+    const keyword = q.trim();
+    if (!keyword) return MOCK_SITES;
+    return MOCK_SITES.filter((s) => s.name.includes(keyword));
+  }, [q]);
+
+  const isSelected = (id: string) => selected.some((s) => s.id === id);
+
+  const toggleSelect = (item: CandidateSite) => {
+    setSelected((prev) => {
+      const exists = prev.some((p) => p.id === item.id);
+      if (exists) return prev.filter((p) => p.id !== item.id);
+
+      if (prev.length >= maxSelect) return prev; // 최대 개수 초과 방지
+      return [...prev, item];
+    });
+  };
+
+  const removeChip = (id: string) => setSelected((prev) => prev.filter((p) => p.id !== id));
+
+  if (!open) return null;
+
+  return (
+    <div
+      className="fixed inset-0 z-[1000] flex items-center justify-center"
+      role="dialog"
+      aria-modal="true"
+      aria-label="후보지 조회"
+    >
+      {/* overlay */}
+      <button
+        type="button"
+        className="absolute inset-0 bg-black/30"
+        aria-label="모달 닫기"
+        onClick={onClose}
+      />
+
+      {/* panel */}
+      <div className="relative w-[94vw] max-w-[1400px] rounded-xl bg-white shadow-xl">
+        {/* header */}
+        <div className="flex items-center justify-between px-8 py-6">
+          <h2 className="text-2xl font-extrabold text-neutral-900">후보지 조회</h2>
+          <button
+            type="button"
+            aria-label="닫기"
+            onClick={onClose}
+            className="grid h-10 w-10 place-items-center rounded-sm hover:bg-neutral-100"
+          >
+            ✕
+          </button>
+        </div>
+        <div className="h-px w-full bg-neutral-200" />
+
+        {/* body */}
+        <div className="px-8 py-6">
+          <div className="grid grid-cols-12 gap-6">
+            {/* left: search + table */}
+            <div className="col-span-12 lg:col-span-5">
+              <div className="mb-3 text-lg font-semibold text-neutral-900">후보지 검색</div>
+
+              <div className="relative">
+                <input
+                  value={q}
+                  onChange={(e) => setQ(e.target.value)}
+                  placeholder="주소검색"
+                  className="h-12 w-full rounded-sm border border-neutral-300 bg-white px-4 pr-12 text-sm outline-none focus:border-sky-500"
+                />
+                <button
+                  type="button"
+                  aria-label="검색"
+                  onClick={() => setQ((v) => v.trim())}
+                  className="absolute right-2 top-1/2 -translate-y-1/2 grid h-9 w-9 place-items-center rounded-full text-[#01ACE5] hover:bg-slate-100"
+                >
+                  <svg width="18" height="18" viewBox="0 0 24 24" fill="none">
+                    <path
+                      d="M10.5 18a7.5 7.5 0 1 1 0-15 7.5 7.5 0 0 1 0 15Z"
+                      stroke="currentColor"
+                      strokeWidth="2"
+                    />
+                    <path
+                      d="M21 21l-4.3-4.3"
+                      stroke="currentColor"
+                      strokeWidth="2"
+                      strokeLinecap="round"
+                    />
+                  </svg>
+                </button>
+              </div>
+
+              {/* table header */}
+              <div className="mt-4 overflow-hidden rounded-sm border border-neutral-200">
+                <div className="grid grid-cols-12 bg-emerald-50/70 px-4 py-3 text-sm font-semibold text-neutral-800">
+                  <div className="col-span-6 flex items-center justify-center">시설명</div>
+                  <div className="col-span-2 text-center">
+                    하수처리량<br />(m³/일)
+                  </div>
+                  <div className="col-span-2 text-center">
+                    재이용량<br />(m³/일)
+                  </div>
+                  <div className="col-span-2 text-center">선택</div>
+                </div>
+
+                {/* rows */}
+                <div className="max-h-[420px] overflow-auto">
+                  {filtered.length === 0 ? (
+                    <div className="px-4 py-10 text-center text-sm text-neutral-500">
+                      검색 결과가 없습니다.
+                    </div>
+                  ) : (
+                    filtered.map((s, idx) => {
+                      const picked = isSelected(s.id);
+                      const disabled = !picked && selected.length >= maxSelect;
+                      return (
+                        <div
+                          key={s.id}
+                          className="grid grid-cols-12 items-center gap-2 border-t border-neutral-200 px-4 py-3 text-sm"
+                        >
+                          <div className="col-span-6 truncate">
+                            <span className="mr-2 text-neutral-500">{idx + 1}</span>
+                            {s.name}
+                          </div>
+                          <div className="col-span-2 text-center">{s.sewageM3d.toLocaleString()}</div>
+                          <div className="col-span-2 text-center">{s.reuseM3d.toLocaleString()}</div>
+                          <div className="col-span-2 flex justify-center">
+                            <button
+                              type="button"
+                              disabled={disabled}
+                              onClick={() => toggleSelect(s)}
+                              className={[
+                                "h-8 rounded-sm px-3 text-xs",
+                                picked ? "bg-gray-600 text-white" : "bg-sky-500 text-white hover:bg-sky-600",
+                                disabled ? "cursor-not-allowed opacity-40" : "",
+                              ].join(" ")}
+                            >
+                              {picked ? "해제" : "선택"}
+                            </button>
+                          </div>
+                        </div>
+                      );
+                    })
+                  )}
+                </div>
+              </div>
+
+              {/* <div className="mt-2 text-xs text-neutral-500">
+                최대 {maxSelect}개까지 선택 가능합니다.
+              </div> */}
+            </div>
+
+            {/* right: map */}
+            <div className="col-span-12 lg:col-span-7">
+              <div className="h-[520px] w-full overflow-hidden rounded-sm border border-neutral-200 bg-neutral-50 relative">
+                {/* TODO: 실제 지도 SDK 연동 시 이 영역 교체 */}
+                <div className="absolute inset-0 grid place-items-center text-sm text-neutral-500">
+                  지도 영역(추후 지도 SDK 연동)
+                </div>
+
+                {/* 선택된 항목의 "가짜 마커" */}
+                {selected.map((s, i) => {
+                    const POS = [
+                        { top: "40%", left: "45%" },
+                        { top: "25%", left: "75%" },
+                        { top: "70%", left: "80%" },
+                  ] as const;
+
+                  const pos = POS[i % POS.length] ?? POS[0];
+
+                  return (
+                        <div
+                        key={s.id}
+                        className="absolute"
+                        style={{ top: pos.top, left: pos.left }}
+                        >
+                        <MapMarker label={String(i + 1)} />
+                        </div>
+                    );
+                })}
+              </div>
+            </div>
+          </div>
+
+          {/* selected chips */}
+          <div className="mt-6">
+            <div className="mb-2 text-lg font-semibold text-neutral-900">
+              선택된 시설 <span className="text-sm font-normal text-neutral-500">(시설명/하수처리량(m³/일)/재이용량(m³/일))</span>
+            </div>
+
+            <div className="min-h-[52px] rounded-sm border border-neutral-200 bg-white px-4 py-3">
+              {selected.length === 0 ? (
+                <div className="text-sm text-neutral-500">선택된 시설이 없습니다.</div>
+              ) : (
+                <div className="flex flex-wrap gap-3">
+                  {selected.map((s) => (
+                    <div
+                      key={s.id}
+                      className="inline-flex items-center gap-3 rounded-sm bg-[#EAF5F5] px-4 py-3 text-sm text-[#01ACE5]"
+                    >
+                      <span className="font-medium">
+                        {s.name} / {s.sewageM3d.toLocaleString()}(m³/일) / {s.reuseM3d.toLocaleString()}(m³/일)
+                      </span>
+                      <button
+                        type="button"
+                        aria-label="삭제"
+                        onClick={() => removeChip(s.id)}
+                        className="grid h-7 w-7 place-items-center rounded-sm hover:bg-sky-100 text-neutral-700 font-semibold"
+                      >
+                        ✕
+                      </button>
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
+          </div>
+
+          {/* footer button */}
+          <div className="mt-6 flex justify-center pb-2">
+            <button
+              type="button"
+              onClick={() => onApply(selected)}
+              className="h-11 rounded-sm bg-[#0B4EA2] px-10 text-base text-white hover:opacity-90"
+            >
+              후보지 확인 및 적용
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}
\ No newline at end of file
diff --git a/apps/dm_new/app/(landing)/reuse/apply/register/page.tsx b/apps/dm_new/app/(landing)/reuse/apply/register/page.tsx
index 27883a981..a8a7297d3 100644
--- a/apps/dm_new/app/(landing)/reuse/apply/register/page.tsx
+++ b/apps/dm_new/app/(landing)/reuse/apply/register/page.tsx
@@ -4,6 +4,7 @@
 import { useMemo, useState, useRef } from "react";
 import SubPageHeader from "../../_components/SubPageHeader";
 import WaterQualityRefModal from "../modal/WaterQualityRefModal";
+import CandidateSiteModal, { type CandidateSite } from "../modal/CandidateSiteModal";
 
 type PHRange = { min: string; max: string };
 
@@ -18,6 +19,9 @@ export default function DemandRegisterPage() {
 
   const [openRef, setOpenRef] = useState(false);
 
+  const [openCand, setOpenCand] = useState(false);
+  const [selectedCands, setSelectedCands] = useState<CandidateSite[]>([]);
+
   // 기본정보
   const [reqDate, setReqDate] = useState<string>(today);
   const [reqQty, setReqQty] = useState<string>("");
@@ -251,10 +255,7 @@ export default function DemandRegisterPage() {
                                 <button
                                     type="button"
                                     className="h-11 rounded-md bg-[#888] px-5 text-base text-white hover:bg-neutral-700"
-                                    onClick={() => {
-                                    // TODO: 후보지 조회 모달/검색 연결
-                                    console.log("후보지 조회", { cand1, cand2, cand3 });
-                                    }}
+                                    onClick={() => setOpenCand(true)}
                                 >
                                     후보지 조회
                                 </button>
@@ -290,6 +291,22 @@ export default function DemandRegisterPage() {
 
             </div>
         </main>
+
+        <CandidateSiteModal
+            open={openCand}
+            onClose={() => setOpenCand(false)}
+            initialSelected={selectedCands}
+            onApply={(list) => {
+                setSelectedCands(list);
+
+                // ✅ cand1~3 입력칸에 반영(시설명만 넣는 버전)
+                setCand1(list[0]?.name ?? "");
+                setCand2(list[1]?.name ?? "");
+                setCand3(list[2]?.name ?? "");
+
+                setOpenCand(false);
+            }}
+        />
     </>
   );
 }
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