diff --git a/src/components/summary/study-info-summary.tsx b/src/components/summary/study-info-summary.tsx
index 32038c08..711509cd 100644
--- a/src/components/summary/study-info-summary.tsx
+++ b/src/components/summary/study-info-summary.tsx
@@ -9,6 +9,7 @@ import Button from '@/components/ui/button';
 import { GroupStudyFullResponse } from '@/features/study/group/api/group-study-types';
 import ApplyGroupStudyModal from '@/features/study/group/ui/apply-group-study-modal';
 import { useGetGroupStudyMyStatus } from '@/hooks/queries/group-study-member-api';
+import { useToastStore } from '@/stores/use-toast-store';
 import { useUserStore } from '@/stores/useUserStore';
 import {
   EXPERIENCE_LEVEL_LABELS,
@@ -28,6 +29,7 @@ export default function SummaryStudyInfo({ data }: Props) {
   const queryClient = useQueryClient();
   const [isExpanded, setIsExpanded] = useState(false);
   const memberId = useUserStore((state) => state.memberId);
+  const showToast = useToastStore((state) => state.showToast);
 
   const { basicInfo, detailInfo, interviewPost } = data;
   const {
@@ -119,8 +121,12 @@ export default function SummaryStudyInfo({ data }: Props) {
   const visibleItems = isExpanded ? infoItems : infoItems.slice(0, 4);
 
   const handleCopyURL = async () => {
-    await navigator.clipboard.writeText(window.location.href);
-    alert('스터디 링크가 복사되었습니다!');
+    try {
+      await navigator.clipboard.writeText(window.location.href);
+      showToast('스터디 링크가 복사되었습니다!');
+    } catch {
+      showToast('클립보드 복사에 실패했습니다. 다시 시도해주세요.', 'error');
+    }
   };
 
   const handleApplySuccess = async () => {
@@ -132,11 +138,16 @@ export default function SummaryStudyInfo({ data }: Props) {
     }
   };
 
+  // 신청 마감 여부 체크 (스터디 시작일이 오늘 이전이거나 같은 경우)
+  const isDeadlinePassed =
+    !!startDate && !dayjs(startDate).isAfter(dayjs(), 'day');
+
   const isApplyDisabled =
     isLeader ||
     myApplicationStatus?.status !== 'NONE' ||
     groupStudyStatus !== 'RECRUITING' ||
-    approvedCount >= maxMembersCount;
+    approvedCount >= maxMembersCount ||
+    isDeadlinePassed;
 
   const getButtonText = () => {
     if (myApplicationStatus?.status === 'APPROVED') {
@@ -148,6 +159,9 @@ export default function SummaryStudyInfo({ data }: Props) {
     if (myApplicationStatus?.status === 'REJECTED') {
       return '신청 거절됨';
     }
+    if (isDeadlinePassed) {
+      return '모집 마감';
+    }
 
     return '신청하기';
   };