Tarpley was offered by the Commodores days before his official visit to Boston College last weekend.
"I am now committed to Vanderbilt," he told Scout.com. "I flipped from Boston College." The 6-foot-1, 195-pound Tarpley can play cornerback or safety.
When he was offered by Vanderbilt earlier this month, he said academic and athletic success of the football team was a major drawing point.
"They have coach (Derek) Mason coming (from Stanford), and he's real successful," Tarpley said. "His defense is great. He's a great defensive backs coach, a great defensive coordinator. He helped shut down Oregon and he's continued to have great success at Stanford.
"I think he's bringing that to the table. He sounds real passionate. They see me as a safety/corner. They like that I'm big, physical and strong and play downhill."