Which sentence is correct?

[bit3034]

Are you in modeling?
or
Are you into modeling?

[emsr2d2]

Are you in modeling?
or
Are you into modeling?

It depends what you mean!

Your first sentence means "Are you a model?" (like Kate Moss)
Your second sentence could mean either "Do you like being a model?" or "Do you like making models?" (ie model cars, aeroplanes etc). If I heard that question, I would assume you meant the second definition.

Note you have used the AmE spelling of "modeling". For information, in BrE, it is spelt "modelling".

[bit3034]

Thanks for sharing such a valuable piece of knowledge.