I think a more accurate question would be whether it's hard for expats to find work at a particular income level. After all, you can get a job sweeping trash tomorrow.
That said, it depends on your skill set, ability to speak spanish, and connections within the community. If you're lacking in any of those categories, it'll be pretty tough.
Call centers are a growth industry in Cibao (the region you'll be living in). You might be able to find a decent job, by Dominican standards, there. But regardless, be prepared to take a substantial drop in salary from wherever you come from.
Good luck.