In 2022, Costabile moved to the United States to attend the
University of Maryland, where he played for the
men's soccer team. At the end of his first season, he was named to the
Big Ten All-Freshman Team. On November 3, 2024, he scored his first collegiate goal, in a 2-1 loss to the
Ohio State Buckeyes. At the end of his senior season in 2025, in which he served as team captain, he was named to the All-Big Ten First Team and earned Maryland's Big Ten Sportsmanship Award. ==Playing career==