Hi
Firstly, to secure admissions in a university abroad for PhD, you need to select a topic, develop a synopsis, which has to be presented to the University you are applying to. Nowadays PhD opprtunities abroad offer funding and research opportunities, basis thesis, project etc. For scholarships abroad, You have to present your study area, SOP, LOR along with other requirements. A few name sof universities you can look into are Monash University, Australian National UNIVErsity, University of New South Wales, RMIT, among others. Check individually each university, their eligibility, the PhD subjects they accept, their admission process and so on to have a better understanding.
Erasmus Mundus Scholarships for International Students, Heinrich Boll Scholarships in Germany for International Students, Commonwealth Scholarships for Developing Commonwealth Countries, DAAD Scholarships in Germany for Development-Related Postgraduate Courses are few scholarships you can look into for more assistance.
Hope this helps!!