Unmarried partner visa: Thailand (Bangkok)

Hello Everyone

I'm not sure if this is a right section for this question, but i will give it a try.

I'm an Indian national currently living in Germany. Me and my german boyfriend could soon be relocating to Bangkok (in a few months). My boyfriend's company will be sponsoring his visa but I do not have any job offer from a Thai company.

My question is:
Can my boyfriend be my official sponsor and I could join him on a dependent visa at all as an unmarried partner?
If yes, then is it possible to convert it to a work visa, incase I find something?
If no, then what could be my other visa options?

Thanks in advance everyone for your time and replies.