Drive from Phuket Island up North towards Khao Lak and Thai Muang District of Phang Nga Province (route no. 4). Once reached Thai Muang Town, go straight down the beach. Better ask the local which way to Hard Thai Muang. Drive along the beach and look for your best break.
It was breaking nearly on the beach. We went during falling tide. The waves were fast and steep, compared to other areas around it (e.g. Khao Lak). Park anywhere on the beach, but perhaps closer to little street shops just for safety reasons since is nobody around at all. We surfed right in front of our car where there's a parking spot.
Overview
Atmosphere
We surfed right in front of our cars. This whole coastline, which may be 100-150 kilometers, is absolutely empty of any person. This province is left un-explored so it's all yours in the warm and safe water. Try driving up and down the beach road and find inlets or sand bars. Looks like it'd work really well if there's no wind. There are also many reef breaks far out. Beautiful area all in all.
General
Has a lot of potential. Just need to find where the best break is. Needs the monsoon though, it'll be flat in winter and spring months. No surfing facilities.