You may be eligible for some scholarships there if you have outstanding academic performances. Besides, you may apply for the scholarships offered for the nationals of your country by various governmental and non-governmental organizations.

Another best thing you can do is to choose the school you may want to attend, and then inquire them about the available financial aids there. Usually, the students with insufficient funds do not qualify for student visa for Spain. You must show your financial ability before you can attend to any Spanish university and obtain a study permit there.