Hi Leonida.
I'm currently living and practicing in Greece, just come back from Sydney, Australia. You will not be able to work anywhere unless you have the registration (adeia askisews epaggelmatos) as a physiotherapist. My advice is to look up which countries don't require much extra effort and take it from there. For example the US, Canada, New Zealand and Australia are really demanding in their requirements and exams, I know first hand