Working holiday in Japan as a tradie?

I'm going on a massive trip soon and i'm considering working in japan as a sort of long working holiday (up to a year, maybe longer?).

I'm employed in Australia as a mechanical fitter/machinist (certificate III Mechanical Engineering Trade) also known as a Millwright in the US.

Does a cert 3 easily transfer from Aus to Japan? And how likely is it i'd be sponsored for a visa by an employer?

I know limited japanese but am interested in/have been trying to learn.