There's nothing shocking or even unusual about what you describe. You don't say what country you're from or where you're thinking of going. But here in the U.S., people routinely move from one part of the country to another to take advantage of more and better jobs at the destination. Places with more jobs routinely send representatives to places with fewer jobs to recruit employees.
I wouldn't even bring it up in a resume or job application. If someone asks, say "I'm looking for better opportunities." If they push for more detail, just tell the truth: In my home country, unemployment is high and its hard to find a good job even if you're a well-qualified person.
I'd be surprised if someone asked for details, except maybe out of curiosity. I'd be VERY surprised if someone thought this was a bad reason. Frankly, if someone pushed for details, I'd suspect that they wanted to make sure that this was the real reason, and not that you couldn't find a job because you're lazy and irresponsible, or you have to get out of the country before the police catch you, or some such.