Additional provinces to open for tourism according to TAT. From 1st of October Chiang Mai, Chonburi, Phetchaburi, Bangkok and Prachuap Kiri Khan.
Update. Chiang Mai is opening on the 1st of November. But for Phuket Sandbox there is now a 7 days sandbox with 2 PCR test. After that you can travel to other parts of Thailand.
From the end of October, another 21 provinces will open for instance Chiang Rai, Ayutthaya, Songkhla, Lamphun and Mae Hong Son. The plan is that the whole country should be open around January 13th 2022. Exactly under what conditions we will have to wait and see. And follow the updates from TAT. At the moment the idea about sealed travel routes in Chiang Mai is reconsidered for instance.