Like most other countries, Ireland requires candidates from many non-EU countries to have a visa to come and study in Ireland. If you are a citizen of any of the non-EU countries on this list you will need a visa to study in Ireland.
Ireland is not a member of the Schengen Agreement. You will, therefore, still have to apply for an Irish visa even if you have a visa for a Schengen country.
Applicants are advised to apply for their visa as early as possible as it normally takes eight weeks for it to be processed but in busy periods it may take longer than this. All applicants must apply for a visa using the Online Visa Application Facility only.
For detailed information , see Student Visa Requirements