Head, a sophomore, visited the SMU campus for two days and committed before leaving Thursday morning. He played 1½ seasons at Illinois before leaving in December. He will have to sit out next season.
Head said his relationship with SMU assistant Jerrance Howard, who also recruited Head to Illinois, was the main reason for his commitment.
"He's a great friend. He's like a brother to me," Head said of Howard. "Everything he told me about SMU was true. Coach (Larry) Brown is great to be around. The coaching staff was pretty good. The facilities they're working on look great. They have some great players coming in. I got a good look at everything.
"I just want to get back out there and play. It's time for me to get better and work on my game."
Howard, an assistant under former Illinois coach Bruce Weber, was not retained by new coach John Groce, who was hired in March.
Head said in January he planned to transfer to DePaul, but he said his situation changed with Howard recently being hired at SMU by Brown, the Hall of Fame coach who also added former Illinois State coach Tim Jankovich as his top assistant.
Head averaged 1.0 points, 0.6 rebounds, 1.0 assists and 9.2 minutes in nine games with Illinois last season. He was a highly touted recruit for the Illini out of Rich South High School in Richton Park, Ill. He was ranked No. 79 in the Class of 2010 by ESPNU 100.