The school announced the addition on Wednesday. Llewellyn, who played three seasons with the Ivy League school, will be eligible to play this fall.
Llewellyn is a 6-foot-2 point guard from Canada who was selected to the All-Ivy League first team last season after averaging 15.7 points. He was eighth in the conference at 3-point shooting (38.6%).
He led his team in scoring the past two seasons.