The arrest was made at a residence on Sai Nam Yen Rd on Monday (Feb 2), Patong Police confirmed.
Police said officers seized one bag containing about 10g of cocaine from the suspect at the scene.
The man, not named by Patong Police, was charged with selling a Category 2 narcotic by illegally possessing cocaine for sale.
The suspect and the seized drugs were taken to Patong Police Station for further legal proceedings.