Hi, I am a commerce graduate, working as an accountant. I am very interested in interior designing, Is it possible to change my profession from an Accountant to Interior Designer ?

Best action is to consider taking a short Interior design Diploma program that would certify you as am Interior Designer. 

Yes, it is very easy.

There is no undergradate requirement to be an Interior Designer. You can do a 6-9 month diploma and get a grip of the practical applications to be able to work successfully or even start a venture.

Yes, you can attend the Interior Designing Course and you will be able to work as a freelancer.