People who have achieved there bachelors in Architecture are only eligible for the course of M.Arch. So if you are from Civil Engineering background you can't do M.Arch but you can do M.Plan program which is essentially one of the equivalent program of M.Arch.

To know more about M.Arch visit the link below:

https://www.careers360.com/courses/m-arch-master-of-architecture

To know more about M.Plan visit the link below:

https://www.careers360.com/courses/m-plan-master-of-planning

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