That depends on
- what country you're talking about
- where you were educated, more so residency but med school can be an issue
- what your specialty is and what certifications you have
- what citizenship(s) you (or possibly your spouse) hold
- what languages you speak and how fluently you speak them
- whether you want to work permanently, locum tenens, etc.
- whether you want to work in a big fancy hospital or if you're willing to go where the work is needed
- and on and on and on...