Going to play in Japan

This FAQ answer should give you a good start.

Gambare!

Hi Trey:

The problem is that since you don't have much of a
fastball or what would be called a plus pitch, it's pretty unlikely a Japanese team would be interested in
you. Independent leagues are Class A to Class AA qualitatively. The thing is that Japan is rife with pitchers who have the same (or better) stuff you do with similar command and those players don't have to worry about adjusting to the culture and language. Too, there are veteran MLB pitchers in the Japanese minors
(Greg Hansell, for example).

The other issue is that Japanese teams almost always want players who have already been through a major league organization both for prestige reasons
and from a coaching point of view. Moreover, unless you're connected with an agent who has had experience
dealing with the Japanese, who are from a country where
personal relationships are paramount, it makes it a tough row to hoe without that MLB background.

If you want to play outside of the U.S., you might see if you can get hooked up into playing in Mexico or
maybe a country like Italy. Korea would be a reach, but
it might be worth a shot. Note, though, that the playing conditions in those nations aren't nearly as
good as they are in the U.S. or in Japan (and Mexico is
bad for personal safety reasons). I suppose you could also check into Puerto Rico and Venezuelan winter leagues. Sorry I couldn't be more encouraging.