no, but from a recognised, Native English Speaker, country. Countries such as S.Africa, prospective, teachers, must pass a test with the British Council?
Thai government, schools, only require a degree, but you will only be teaching, for 4 years, on a temporary, teaching, licence. After that you will need, a postgraduate diploma, in teacher? (l forgot it's exact name, l didn't do it) education. Only valid in Thailand & taken, usually at weekends/evenings at a Thai University. & will cost.
If your income differs from month to month, it's not a salary, by the way... 555 l work for the NHS, waiting for the results of our spouse visa application, non salaried, as my income varies...