Thung Thong Police were alerted to the accident at 4:30am.
Officers arrived at the scene, near the Tesco supermarket about 40 0 metres east of the Sikor Intersection, to find the body of Chakkrit Rungboon, who had suffered severe head trauma.
Nearby was the wreckage of a Honda Wave motorcycle registered in Rachaburi.
Police found no signs of a helmet at the crash site.
“There were no witnesses to the accident, so we will check CCTV in the area,” said Pol Capt Wattanakorn Bumrungthin.
“We believe he was riding his motorbike from Phuket Town to his home in Kathu. He may have lost control of his motorcycle at high speed and crashed, or he could have been trying to avoid another vehicle,” he added.
Mr Chakkrit’s body was taken to Vachira Phuket Hospital.