Michael Hoey ended eight shots behind Thailand Classic winner, Australian Andrew Dodt, after carding a final-round 71 on Sunday.
Northern Irishman Hoey finished in a tie for 31st position on eight under.
Dodt fired a closing 67 to end 16 under, one ahead of compatriot Scott Hend, who led on 15 under going into the final round, and Thongchai Jaidee.
Ireland's Damiem McGrane posted a final-round 70 to take joint 66th place on three under.
Hoey, who fired a course record 64 on the opening day, had a level-par 72 in the second round, then a third-round 73 on Saturday.