Yeah! Its very possible for you to do a job in the field of CSE even if you are from civil engineering. Infact you will see that in most of the companies like TCS, WIPRO etc there are lot of people working from Civil, Mechanical and Electrical branches in programming and IT jobs. But the point is that if you be a CSE student then you have to just study your curriculum but for this case you have to put some extra efforts. See every field of engineering introduces programming skills so you should focus more on that. Try to learn languages like Python, JAVA,C++,C. If you can learn this 4 languages then you will clear most of the IT job companies. Some of them also prefer SQL. So if you have time i.e., if you are in 1 or 2nd year of your BTech then try to learn as much coding as you will learn and your dream will come true thats for sure.

I hope my answer helps. All the very best for your future endeavors!