A few years back I enrolled in the
Heriot-Watt University MBA distance learning program. I was in Australia at the time, and it was possible to take as many modules as you thought you can cope with. You have a certain time frame to complete them. I think it was 7 years at the time to complete the module.
When you feel comfortable with the module, then it's just a matter of booking yourself into the exam. The exam centers are in convenient locations worldwide.