Sim, who followed a victory last month in California in the Stonebrae Classic with a playoff loss in the Athens Regional Foundation Classic, closed with a 2-under 69 on the Thornblade Club course to match Gomez (65) at 22-under 264.
The 24-year-old Sim earned $126,000, giving him a tour-best $367,417 in seven starts. He's $211,136 ahead of No. 2 Garth Mulroy, the largest gap in tour history.
"I had a great offseason and I sat down with my coaches and set some goals for the year," said Sim, a victory away from earning an in-season promotion to the PGA Tour. "I hadn't really been doing that lately. My biggest goal was to try and win three times. I also wanted to finish No. 1 on the money list."
D.J. Brigman (64) and Blake Adams (69) tied for third at 19 under.
Sim also teamed with singer Javier Colon to win the pro-am division. They finished with a 62 for a 47-under total.