What documents do I need to obtain a motorcycle license on a multiple entry tourist visa in Thailand?

Unfortunately seeing as this isn't thai visa related at all I'd say the O/P has enough information to at least get down the road towards getting a license.

Have a thai friend call the Department of Land Transport and see what is required where you live.

Good Luck (y)

Medical certificate (new one recently came out, old one no longer accepted). Copy of passport page, entry stamp, visa, residence certificate. Depending what class of licence you hold, you may need to print off information for them from your home licence issuer to show them what vehicles you are entitled to drive there (guy ahead of my had a licence for 10 ton vehicle, and they made him prove he could use it for simple car licence. Your current licence (not expired). Always take more than you need because they will inevitably want you to go get a copy of something else. And if you are getting car and motorcycle licence, two copies of everything above. Some will say it’s overkill, but every office is different depending on the person accepting your documents.

Yes that seems to be the norm

You can get a proof of residence paper from the immigration office or from your consulate. You need that, a medical certificate, your current valid license from your country and your passport. Take those things to the Department of land transport and you can get a two-year temporary Thai driver's license

It seem to be different with everyone. I just took my English driving licence and exchange it for Thai. No other documents needed.???

Ypu can pay an agency which ia super expensive or you can get a certificate of residency fron immigration (if you are renting you need rental agreement) once you have this you can do teat yourself. You need a medical certificate as well