diff --git a/packages/common/components/src/ui/lnb/index.tsx b/packages/common/components/src/ui/lnb/index.tsx
index e3b65dc63..99c7402d7 100644
--- a/packages/common/components/src/ui/lnb/index.tsx
+++ b/packages/common/components/src/ui/lnb/index.tsx
@@ -57,6 +57,7 @@ export function LNB({
   const [currentMenuCode, setCurrentMenuCode] = useState<number | null>(null);
   const prevPathRef = useRef(currentPath);
   const { browser } = useDetectDevice();
+  const { isMobile, setOpenMobile } = useSidebar();
 
   const appSiteId = getCookie("site-id-key") ?? "";
   const siteId = propSiteId ?? appSiteId;
@@ -90,6 +91,38 @@ export function LNB({
     return currentPath?.startsWith(path);
   }
 
+  function handleSidebarKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
+    if (event.key !== "Tab") return;
+
+    const menuControls = Array.from(
+      event.currentTarget.querySelectorAll<HTMLElement>(
+        '[data-sidebar="menu-button"], [data-sidebar="menu-sub-button"]',
+      ),
+    ).filter(
+      (control) =>
+        control.tabIndex >= 0 &&
+        !control.hasAttribute("disabled") &&
+        control.getAttribute("aria-disabled") !== "true" &&
+        !control.closest('[hidden], [aria-hidden="true"]'),
+    );
+    const currentIndex = menuControls.findIndex(
+      (control) =>
+        control === event.target ||
+        control.contains(event.target as Node),
+    );
+
+    if (currentIndex < 0) return;
+
+    const nextIndex = currentIndex + (event.shiftKey ? -1 : 1);
+    const nextControl = menuControls[nextIndex];
+
+    if (nextControl) {
+      event.preventDefault();
+      nextControl.focus();
+      nextControl.scrollIntoView({ block: "nearest" });
+    }
+  }
+
   useEffect(() => {
     if (!menuList || !currentPath) return;
 
@@ -127,6 +160,7 @@ export function LNB({
     if (prevPathRef.current !== currentPath) {
       setDefaultOpenMenuIds(matchedMenuIds);
       prevPathRef.current = currentPath;
+      if (isMobile) setOpenMobile(false);
     }
 
     if (matchedMenuCode) {
@@ -142,7 +176,7 @@ export function LNB({
       siteId,
       urlPath: currentPath,
     });
-  }, [menuList, currentPath]);
+  }, [menuList, currentPath, isMobile, setOpenMobile]);
 
   function MenuItem({
     item,
@@ -151,65 +185,104 @@ export function LNB({
     item: MenuItem;
     isSubMenu?: boolean;
   }) {
-    const { open: isSidebarOpen, setOpen } = useSidebar();
+    const {
+      open: isSidebarOpen,
+      setOpen,
+      isMobile: isMobileView,
+      setOpenMobile: closeMobileSidebar,
+    } = useSidebar();
     const isMatched =
       isPathMatched(item.urlPath) && currentMenuCode === item.menuCd;
+    const hideLabel = !isSidebarOpen && !isMobileView;
 
-    const handleClick = () => {
-      if (!isSidebarOpen) setOpen(true);
+    const handleClick = (event: React.MouseEvent<HTMLAnchorElement>) => {
       setCookie("menu-code-key", item.menuCd.toString());
 
-      // newWndwYn이 Y인 경우 새창으로 열기
-      if (item.newWndwYn === "Y") {
-        window.open(item.urlPath, "_blank");
+      if (item.newWndwYn !== "Y" && handleMenuClick) {
+        event.preventDefault();
+        handleMenuClick(item);
+        if (isMobileView && currentPath === item.urlPath) {
+          closeMobileSidebar(false);
+        }
+      } else if (isMobileView) {
+        closeMobileSidebar(false);
       }
-
-      handleMenuClick?.(item);
     };
 
-    if (item.children) {
+    if (item.children?.length) {
       return <MenuGroup item={item} />;
     }
 
-    const MenuItem = isSubMenu ? SidebarMenuSubItem : SidebarMenuItem;
-    const MenuButton = isSubMenu ? SidebarMenuSubButton : SidebarMenuButton;
+    const menuContent = (
+      <>
+        <i
+          className={cn(
+            "diveicon",
+            `di-${item.iconNm}`,
+            !hideLabel && "ml-2",
+          )}
+        />
+        <span className={cn("whitespace-nowrap", hideLabel && "hidden")}>
+          {item.menuKornNm}
+        </span>
+      </>
+    );
+    const linkProps = {
+      href: item.urlPath,
+      target: item.newWndwYn === "Y" ? "_blank" : undefined,
+      rel: item.newWndwYn === "Y" ? "noopener noreferrer" : undefined,
+      "aria-current": isMatched ? ("page" as const) : undefined,
+      onClick: handleClick,
+    };
+    const menuClassName = cn(
+      "h-auto cursor-pointer py-4 text-[1.4rem] text-label transition-colors hover:bg-accent",
+      isMatched && "bg-accent !text-primary",
+      !isSidebarOpen && "justify-center",
+    );
+
+    if (isSubMenu) {
+      return (
+        <SidebarMenuSubItem>
+          <SidebarMenuSubButton
+            {...linkProps}
+            className={menuClassName}
+            data-matched={isMatched}
+            isActive={isMatched}
+          >
+            {menuContent}
+          </SidebarMenuSubButton>
+        </SidebarMenuSubItem>
+      );
+    }
 
     return (
-      <MenuItem>
-        <MenuButton
-          className={cn(
-            "h-auto cursor-pointer py-4 text-[1.4rem] text-label transition-colors hover:bg-accent",
-            isMatched && "bg-accent !text-primary",
-            !isSidebarOpen && "justify-center",
-          )}
+      <SidebarMenuItem>
+        <SidebarMenuButton
+          asChild
+          className={menuClassName}
           data-matched={isMatched}
-          onClick={handleClick}
           tooltip={item.menuKornNm}
         >
-          <i
-            className={cn(
-              "diveicon",
-              `di-${item.iconNm}`,
-              isSidebarOpen && "ml-2",
-            )}
-          />
-          <span className={cn("whitespace-nowrap", !isSidebarOpen && "hidden")}>
-            {item.menuKornNm}
-          </span>
-        </MenuButton>
-      </MenuItem>
+          <a {...linkProps}>{menuContent}</a>
+        </SidebarMenuButton>
+      </SidebarMenuItem>
     );
   }
 
   function MenuGroup({ item }: { item: MenuItem }) {
-    const { open: isSidebarOpen, setOpen: setSidebarOpen } = useSidebar();
+    const {
+      open: isSidebarOpen,
+      setOpen: setSidebarOpen,
+      isMobile,
+    } = useSidebar();
+    const hideLabel = !isSidebarOpen && !isMobile;
     const [isOpen, setIsOpen] = useState(
       defaultOpenMenuIds.includes(item.menuCd),
     );
 
     const handleOpenChange = (open: boolean) => {
       setIsOpen(open);
-      if (!isSidebarOpen) setSidebarOpen(true);
+      if (!isMobile && !isSidebarOpen) setSidebarOpen(true);
     };
 
     return (
@@ -233,13 +306,13 @@ export function LNB({
                   className={cn(
                     "diveicon text-label",
                     `di-${item.iconNm}`,
-                    isSidebarOpen && "ml-2",
+                    !hideLabel && "ml-2",
                   )}
                 />
                 <span
                   className={cn(
                     "whitespace-nowrap text-label group-hover/menu-button:text-foreground",
-                    !isSidebarOpen && "hidden",
+                    hideLabel && "hidden",
                   )}
                 >
                   {item.menuKornNm}
@@ -249,7 +322,7 @@ export function LNB({
                 className={cn(
                   "ml-auto !size-6 text-label transition-transform",
                   isOpen && "rotate-90",
-                  !isSidebarOpen && "hidden",
+                  hideLabel && "hidden",
                 )}
               />
             </SidebarMenuButton>
@@ -270,11 +343,14 @@ export function LNB({
     <Sidebar
       collapsible="icon"
       className={cn(
-        "border-border bg-background px-4 pt-[6rem]",
+        "border-border bg-background px-4 pt-14 md:pt-[6rem]",
         classNames?.wrapper,
       )}
     >
-      <SidebarContent className="bg-background">
+      <SidebarContent
+        className="bg-background"
+        onKeyDown={handleSidebarKeyDown}
+      >
         <SidebarMenu className="gap-0">
           {menuList?.map((item) => (
             <MenuItem key={item.menuCd} item={item} />
diff --git a/packages/common/components/src/ui/sheet/index.tsx b/packages/common/components/src/ui/sheet/index.tsx
index 10a35d74c..f2672b822 100644
--- a/packages/common/components/src/ui/sheet/index.tsx
+++ b/packages/common/components/src/ui/sheet/index.tsx
@@ -67,7 +67,7 @@ const SheetContent = React.forwardRef<
       {children}
       <SheetPrimitive.Close className="absolute right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-secondary">
         <X className="h-4 w-4" />
-        <span className="sr-only">Close</span>
+        <span className="sr-only">닫기</span>
       </SheetPrimitive.Close>
     </SheetPrimitive.Content>
   </SheetPortal>
diff --git a/packages/common/components/src/ui/sidebar/index.tsx b/packages/common/components/src/ui/sidebar/index.tsx
index 4333e9f92..c9a945ccf 100644
--- a/packages/common/components/src/ui/sidebar/index.tsx
+++ b/packages/common/components/src/ui/sidebar/index.tsx
@@ -211,7 +211,7 @@ const Sidebar = React.forwardRef<
           <SheetContent
             data-sidebar="sidebar"
             data-mobile="true"
-            className="w-[--sidebar-width] bg-sidebar p-0 text-sidebar-foreground [&>button]:hidden"
+            className="h-[100dvh] max-h-[100dvh] w-[--sidebar-width] overflow-hidden bg-sidebar p-0 text-sidebar-foreground [&>button]:z-50 [&>button]:rounded-sm [&>button]:p-2 [&>button]:text-sidebar-foreground [&>button]:opacity-100 [&>button]:hover:bg-sidebar-accent"
             style={
               {
                 "--sidebar-width": SIDEBAR_WIDTH_MOBILE,
@@ -223,7 +223,14 @@ const Sidebar = React.forwardRef<
               <SheetTitle>Sidebar</SheetTitle>
               <SheetDescription>Displays the mobile sidebar.</SheetDescription>
             </SheetHeader>
-            <div className="flex h-full w-full flex-col">{children}</div>
+            <div
+              className={cn(
+                "flex h-full min-h-0 w-full flex-col",
+                className,
+              )}
+            >
+              {children}
+            </div>
           </SheetContent>
         </Sheet>
       );
@@ -281,12 +288,22 @@ const SidebarTrigger = React.forwardRef<
   React.ElementRef<typeof Button>,
   React.ComponentProps<typeof Button>
 >(({ className, onClick, ...props }, ref) => {
-  const { toggleSidebar } = useSidebar();
+  const { toggleSidebar, isMobile, openMobile, state } = useSidebar();
 
   return (
     <Button
       ref={ref}
       data-sidebar="trigger"
+      aria-label={
+        isMobile
+          ? openMobile
+            ? "좌측 메뉴 닫기"
+            : "좌측 메뉴 열기"
+          : state === "expanded"
+            ? "좌측 메뉴 접기"
+            : "좌측 메뉴 펼치기"
+      }
+      aria-expanded={isMobile ? openMobile : state === "expanded"}
       variant="ghost"
       size="icon"
       className={cn("h-7 w-7", className)}
@@ -297,7 +314,7 @@ const SidebarTrigger = React.forwardRef<
       {...props}
     >
       <PanelLeft />
-      <span className="sr-only">Toggle Sidebar</span>
+      <span className="sr-only">좌측 메뉴 열기/닫기</span>
     </Button>
   );
 });
@@ -422,7 +439,7 @@ const SidebarContent = React.forwardRef<
       ref={ref}
       data-sidebar="content"
       className={cn(
-        "flex min-h-0 flex-1 flex-col gap-2 overflow-auto group-data-[collapsible=icon]:overflow-hidden",
+        "flex min-h-0 flex-1 flex-col gap-2 overflow-x-hidden overflow-y-auto overscroll-y-contain touch-pan-y group-data-[collapsible=icon]:overflow-hidden",
         className,
       )}
       {...props}