Police named him as Win Phuay, a Burmese construction worker. The crash came in Thepkasattri Road not far from the Tesco Lotus outlet in Thalang.
Witness Soradtha Thanapatirangsan, 43, told police that Khun Win was overtaking another motorcyclist when he fell.
With the Songkran New year holiday drawing close, extra precautions are likely to be taken to try to reduce the number of deaths on Phuket's roads.
It's not known whether authorities are winning or losing the year-round battle to reduce fatalities and crashes.
No official statistics have been released for the road toll on Phuket for 2012 and no monthly updates have been released since last April, when Phuket Public Health ceased publishing figures.