Boyanov made 5 of 7 field goals and recorded his first career double-double.
Spring Hill led in this one as late as 1:37 in the first half at 24-22, but the Jaguars used a 6-0 run to close the half and lead 28-24 at intermission.
Ken Williams had 12 points and Taishaun Johnson added 11 points for South Alabama, which shot just 36 percent from the floor, including 9 of 25 from beyond the arc. The Jaguars made 22 of 31 free throws.
Spring Hill was led by Matevz Rojc with 10 points.