For Foreigner

A foreigner is allowed to buy car in Thailand by 2 types as the following.

1 Cash.
If you want to buy a car in Thailand by cash, you need the following documents:
Documents
-Visa
-Work permit or Certificate of residence.(from the immigration office)

2 hire purchase
If you want to buy a car in Thailand by hire purchase, you need the following documents:

Documents
-Visa
-Work permit.
-Copy of salary slip 
-6 months bank statement 
-Your office map and your residence map

Choice if you have a Thai nationality as guarantee.
- 25% or more for down payment.
- at least 3 years work permit.

Choice if you don't have Thai nationality as guarantee.
- 50% or more for down payment.
- at least 5 years work permit.