Sehic is a four-star recruit on ESPN and ranked by them as the No. 11 player in Texas.
Sehic said one of the reasons he chose Vanderbilt was the opportunity to play against teams like Florida and Kentucky.
"Of course you want to play against the best teams in the country and you want to be one of the best teams in the country," he said. "I feel like with the players Vanderbilt has there right now, and by adding me and (D'jery) Baptiste and a couple of other guys, we can be really good."
Sehic is the fourth Commodores commit from the Class of 2015, joining Baptiste (a four-star), four-star Camron Justice and three-star Joseph Toye.
Together, they make up 247Sports' No. 30 class in the nation and fourth-best in the SEC.
- Molly Geary