Thai Traffic Act B.E. 2522
Title 3: Driver's License
Section 42
Anyone who wishes to drive a motor vehicle on public roads must possess an appropriate driver's license.
The driver must carry the driver's license and a photocopy of the registration book and show them to
competent officers upon request. This does not apply for those who are learning to drive a motor vehicle
according to the provision of Section 57.

Section 56
The owner or driver of a motor vehicle must not let anyone without a proper driver's license to drive the
vehicle, except under the provisions of Section 57

Section 57
When practicing to drive a motor vehicle, the learner must be under the instruction of a driver who has had
the license for that vehicle for at least 3 years.

During the driving lesson, no other person than the learner and the instructor may stay in the vehicle.

The instructor is responsible for any damage or accident during a lesson, unless it is proved that the learner
refused to obey his instruction.
Don's Life In Thailand  (Chiang Mai)
Driving License Thailand

There is no Driving Permit

Unless There has been Changes, which I cannot find any, below is the
information for learning to drive in Thailand