So you have completed your graduation in the field of civil engineering and so now, as per one of the eligibility criteria, graduates from any field are allowed to  obtain a degree , diploma or certificate in the course of Interior Design . If you are really passionate about interior designing then surely you can go for it after your btech now and pursue your career in the same.

Refer to the site below for more details about the same..

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

Best wishes. Thank you.

Dear Aspirant,

There are various institutes which provide interior design program without any pre requisite of educational qualification. For PG Diploma in Interior design one needs to pass graduation from any stream  with minimum 55% from recognized university.

So being a civil engineer you can definitely pursue interior designing course

Hope this helps