The answer is Yes. sure you can take this game online.
However, it's going to be a lot of work. I do mean a lot. If you need help please ask questions :)
However, i suggest doing some research.
* How much work are you willing to put in since you will be working mostly from scratch
* Are you going to Host the server on your computer
* Are you going to pay for a server
I'm willing to offer advice and help design the structure.