They are widely available in all areas of India these days but before you look at them on an individual basis, you need to seriously think about what you want to achieve from the course. Few people look for interior design courses in India unless they actually want to embark on a career in the field in the first place but there are numerous areas within the course itself to choose from.
Courses in design are purposely formulated to offer the students on them the skills they need, both practical and in theory, to do the best job they can and succeed in the industry. As such, you should be looking for courses that cater for the requirements of a specific field. For example, you may choose a career in planning and organizing in residential dwellings. Alternatively, you may choose to go into the more commercial side of interior designing and thus into retail, theatre, conferencing or any number of other industries. Always check out your options in the individual areas before applying for various courses.