Hi,
Yes, you can go abroad for MCA course after completing BCA. The global options are open for the study of MCA in UK,Australia,Canada,USA and some other countries ,who are offering quality education.
With a BCA degree, you can also pursue MS abroad in various streams of Computer Science( information technology or computer applications).
You should always check with the university regarding the eligibility criteria in various streams they have on offer.
You have to go through English test to study abroad.
MCA Colleges abroad
Canada- University Of Alberta.

Canada- University Of Toronto.

Germany-Technical University Of Berlin.

USA - Harvard University.

Australia- University Of Melbourne.

All the best for your career choices.