How can I obtain the necessary documents for a work visa in Thailand if my employer sponsors me?

If the company does not provide the staff assistance to apply for a Work Permit and Non Immigrant B Visa then I suggest that they/you hire a Visa Agent (often an Accounting Firm with a Lawyer available for certain documents. If you have little experience in Thailand and cannot read Thai - figuring out the correct documents and WP application form can take weeks and would likely be deficient. Fees range from 15,000 - to 20,000 Baht.

You can get a list of required documents for the WP - Work Permit from the Labor Ministry. And for the B Visa you can download from a Thai Embassy/Consulate website in a country neighboring Thailand.

The WP and B Visa are two separate documents from two different entities but the processes are intertwined and must be followed in the correct sequence.

If the company has no idea what to do, let them visit the Ministry of Labor in the area and ask for the requirements to apply for the Work Permit. All Ministries has a list. They go back to office and start copying the company documents, together with your passport and certification copies they can apply than for the Work Permit. Depending on Ministry of Labor they get directly or a few days later 2 papers, WP3 application in progress and letter, which you have to take to a Thai Embassy or Consulate to apply for the Non Immigrant B visa.

No need for a Visa Service to make some photo copies of your passport and certifications.

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Normally if a company sponsors you they take care of the paperwork,

You only need to fill what is required of you, and the company should have the relevant paperwork.

Best to talk with them