Nope! For Interior Designing UG course, having Physics isn't compulsory. Infact, for the course of Interior Designing, students from any stream can take admission if they have secure atleast 50% marks. Although, its advisable for the students to have Mathematics in 10+2 but its not compulsory.

I would also recommend you to visit the official website of the college you are interested in & check its eligibility criteria as well (sometimes the eligibility may differ).

For more information regarding Interior Designing you can consider the link provided below:

https://www.careers360.com/courses/interior-design-course

I hope this helps. Wish you a great day!