The Uniontown, Ohio, native qualified for his first U.S. Open by shooting 5-under-par 135 at Springfield (Ohio) Country Club. A rising junior at The Ohio State University, Modolvan posted three wins in the 2021-22 season while compiling a 70.79 stroke average. In 2019, he was named the American Junior Golf Association's Player of the Year, and was a member of the 2019 USA Junior Presidents Cup Team. He advanced to the Round of 32 in the 2019 U.S. Amateur, losing to eventual champion Andy Ogletree. That year, he also won the Ohio Amateur. He also won the 2019 AJGA Junior Polo Classic, the lone match-play event on the circuit. He reached the Round of 16 of the 2019 U.S. Junior Amateur.