The victim was identified as Sa-udee Yakoh, 26, a resident of Ban Basar Bayoh in tambon Kalor of Raman district.
Pol Col Uthai Thipsepha, chief of Raman police station, said the shooting occurred about 5.57pm on the Kalor-Tha Rua road in the village.
According to witnesses, Sa-udee was travelling back home on his motorcycle along the local road when gunmen hiding in roadside forest fired at him with assault rifles. The attackers then fled.
Sa-udee took several bullets in his head and torso and died on the spot.
Police were investigating.