Can i get a visa through a language institute?

What you will need is a formal job offer/contract from an academy, in writing.  They must go through a process where they present your offer to the spanish government, to verify that no other spanish person in the area is available to do the job.  Then you need an FBI background check, notarized by the State Department (called an apostille).  You'll then need a full physical from a doctor, signed.  Then, make an appointment online with you nearest Spanish consulate, and be ready to present these documents with your passport.  Your passport has to be "clean" also. The process can take up to three months.  My wife and I did it, and we are now in Spain.  It was a hassle, but worth it, of course.  Or, you can do what some people do, which is come here as a tourist and never leave!  It's risky, but sort of common.

Doing Business in Spain? Tourism? Studies?