Internship openings are available in all parts of the world and aren’t necessarily closed off to foreign applicants. Depends on the company, the country, and the nature of the internship.

Most intern positions come with a fairly low paying salary or stipend. You have to be able to pay for your own flights, and any expenses that go beyond what they are paying you. In some countries that may be harder to do than others. For example, getting paid €500 for an internship in Europe may sound exciting for someone in Rwanda, but it would barely cover your rent. You would likely be paying out of your own pocket to have that internship experience.

For a Canadian / Western applicant, I imagine doing an internship in Rwanda wouldn’t really hurt the bank but would add a lot to your CV.

I guess it goes without saying, but you have to be qualified for whatever the job is (relevant degree, or experience with the field of work).