Answer : If you're looking for courses that teach interior design on a college level, I recommend either
1) Interior Design at the University of Oregon - Eugene
2) Interior Design Program at the School of Visual Arts in New York City.
In both cases, you'll be learning how to use principles and techniques in office or building construction and planning as well as applying these knowledge to residential buildings. You'll also explore materials and specifications for home availability and quality, then use those findings to produce design projects or spec sheets based on your own set of user requirements.