M.Tech

First of all, you have to decide whether you want to go for Regular or Part-Time programme since you are working for 2 years. So, first make your strong decision. After getting the idea, there are n number of universities who provide you with the degree in M.Tech-Civil Engineering. Now Choice is your's, where you want to pursue it.

Please refer to the link provided below for a list of colleges which offer M.Tech agriculture and related courses. You can download their brochure and check if distance courses are offered by the institute:
https://www.shiksha.com/engineering/colleges/m-tech-agriculture-farm-engineering-colleges-india

Hello Alexander,
You may refer the link below for the list of government M.Tech colleges in Karnataka :
https://www.shiksha.com/engineering/colleges/m-tech-colleges-karnataka?rf=filters&ts=15321927&st[]=106&bc[]=86&co[]=Public&uaf[]=base_course&uaf[]=location

Hello Abhi,
It's actually a perception that it's best to do M.Tech in infrastructure rather than pure civil. But, my sincere advise is to don't get swayed by this. You must select that subject in which you have interest and feel comfortable with.