Sciences Po Saint-Germain welcomes students of all nationalities in its degrees. Entrance is possible either as an undergraduate or in a Master degree.
Depending on your nationality, your residence country, your high-school diploma and the level of studies you want to join, the application process to a French institution of higher education will differ.
Therefore, your first step is to register on the appropriate official French platform; all the information about this can be found on Campus France:
Once this is sorted out, you will join the actual application procedure to Sciences Po Saint-Germain, be it written exams, personal file, interviews (more on this below). Foreign applicants take the same entrance exams as French applicants. If French is not your mother tongue, you will need to submit an official certificate in French language.