It is possible you can get modelling contracts in Japan. It's one of the more 'popular' work choices for those who are either on working holiday visa or studying in college.

If you are doing modelling already it might help you in getting work, experience and having references is always a plus.

If you planned on making a long term career out of it in Japan.... i don't think it would really work out.

Regarding being an Actress, it's possible but i would say very tough gig to get into and again no possibility of it working out being a long term career. Again Acting or working on commercials would be easier to get if you already do this work or work for an agency.