No, you don't talk to his sponsor.
I suggest going to an Al Anon meeting and getting your own sponsor.
I guess if you feel like he isn't really going to meetings or doesn't actually have a sponsor that's just something you'll have to come to terms with. His recovery is his business, and yours is yours. I would guess that at some point if there really is a sponsor you'll meet him at some AA social thing; but it's up to him - and it's not so you can check on him.
Sounds sketchy, though? Is that what you think, that he's not going?