Answer : Many colleges offer interior design majors. Some examples would be Boston University, Rhode Island School of Design, and Illinois Institute of Technology.
One online college that offers this major is ALISON. They have a well-documented curriculum and utilize cutting-edge technology for learning how to use building materials such as carpets, paints, wallpaper, etc!
There are many great schools that have talented faculty members who know what they're teaching because they've been working in the industry for years! If you can find a school with teachers who are familiar with your general field and location then you will be able to feel more comfortable about your education because their experience will guide you through the process of learning complex concepts.