Kevin Palmer added 15 points for the Islanders and Demond Watt off the bench and scored 13 points, including seven from free throws.
Cameron Johnson had a double-double with 19 points and 12 rebounds for Texas State (10-13, 3-7), while Brandon Bush scored 18 and John Rybak added 13.
Connecting you to your favorite North Texas sports teams as well as sports news around the globe.
Texas State led 34-32 at the half but lost ground starting with Tim Green's 3-pointer at 12:07 in the second half. Texas A&M-Corpus Christi went ahead for good.