Thomas, a 6-foot-3, 172-pound safety, chose the Golden Panthers on Saturday, citing the opportunity to build something special under head coach Mario Cristobal.
"The opportunity was there," he said. "I have the chance to play as a true freshman with Troy McCollum and Xavier Hines, who committed as well. I feel we can take the program to the next level."
Hines, also a safety at 5-foot-11 snf 176 pounds, committed to FIU on Thursday.
Including Troy McCollum (Miami/North Miami, FIU has landed three defensive back commitments this week.