Can I apply for a work visa in a third country if I have a job offer while on an STV visa in Thailand?

I have flown to both Cambodia and Singapore for a Non-B pre-Covid. Singapore seems to be more set up for it as a lot of firms send people down there. Company I work for sends quite a few staff there for the Non-B before the BOI extension.

I did change from tourist visa to non bi visa without getting out of the country actually if no covid i had to go out and apply from abroad

With a letter from the company, on company letterhead, stating that they want to hire you, and are a legal company that can hire you, and meet the financial obligations to provide you with the needed work permit, yes, you can leave the country, contact the Thai embassy in that country, and get a 90 day type B visa to enter Thailand, then complete the process to extend the visa for the full year, and get your work permit. The amount of paperwork from the company is pretty involved once you get here, and if it is not a teaching job, there is a minimum wage requirement.

Yes you can but now you don’t have to you can change your visa in Thailand only in this covid time.

Wow, sounds like hard work just to change a Visa. Lol.

Good the cop 26 helped for us all to go green. Best wishes to you

Yes you can, as long as you can enter that country AND the Thai consulate of that country is willing to sell you a Non-B visa.