Answer : Yes. There are several online courses and programs that will teach you the basics of interior design. One option is to check out the website of the American Society of Interior Designers, which offers an online course in basic interior design. You can also find many other online courses and programs by doing a quick Google search.
One thing to keep in mind, though, is that to be a successful interior designer, you will need to have a good deal of creativity and artistic talent. So if you're not particularly creative or artistic, you may want to consider pursuing another career in interior design.