I have a WP based on my teaching job, now I did my fitness certification here in Bkk and I am getting (not too many , but 2 or 3 ) offers of personal training which I would love to take as practical exp as I am a fresh meat in fitness industry. Do I really need a permission from my primary employer to get my "extra work" listed in my WP ( from DOL) or it's a mai pen lai affair ?
TLDR : Answer Summary
If you hold a work permit (WP) with one employer and want to take on additional work (like personal training), you require written permission from your primary employer to add this job to your work permit. Working without this permission can lead to severe consequences, including fines or deportation.