What should I do if my employer is not based in the UK for the Thailand 6 month multiple entry visa application?

I think your question has been misunderstood. I have the same issue. Has anyone had success obtaining METV with an overseas employer?

And when you do arrive...do as Robert Lagas noted in reply to your recent post:

"No, you better prepare yourself with 20.000 Thb or equivalent currency in cash, proof of onward travel within these 30 days and proof of accommodation. Best is to also have proof of income from abroad to avoid the suspicion of working in Thailand. The Visa Exempt Entry stamp is not meant to live inside Thailand. Get a visa for your purpose of stay."

Frankly I believe you need to get a job in Thailand that will provide you with a legal work permit. Its clear from your posted comments recently that you are living in Thailand on back to back entries...tourist visas, border runs with extensions. Good luck...and I am sure you are aware that the decision upon your arrival with visa or not is up to the Thai Immigration Officer.

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For Multiple Entries (stay up to 60 days for each entry within the period of 6 months)

A current passport with validity of over 6 months beyond the date of application and at least 2 blank pages

Visa application form completely filled out

Two (2) recent photos of the applicant

Original bank statement of the applicant showing a balance of at least £5,000 (for 6 months) or a print out with official stamp of the bank

A letter from the applicant's employer (in the UK and addressed to the Royal Thai Embassy)

If you are self-employed, you self-assessment and a company registration document are required.

A photocopy of the confirmed air ticket to Thailand

A photocopy of the hotel reservation confirmation in Thailand

Documents in foreign languages must be translated into English and the translation must be certified by the relevant embassy in London.

**Consular officers reserve the rights to request additional documents as deemed necessary.**

-Tourist-Visa.html

-Validity-of-visa-and-permitted-length-of-stay.html

If employed, simply get a letter of employment. If employed in Thailand get a work permit to reside in Thailand legally.