Can i comvert my 2013 ford fiesta to awd?

I want to get into rally and wanted to comvert my car to awd, is it possible

It would be far cheaper to buy an AWD car.

You can check out Ford Racing site and see if they will provide a kit for what you need to Rally:

https://social.ford.com/our-articles/cars/fiesta/build-your-own-fiesta-rally-car/

Theoretically? Anything is possible if you throw enough money at it. To convert a Fiesta to AWD would cost way more than the car.
Reality? Not possible. There's not even a place to put the shafts required to drive the rear wheels.

Yes, its not financially prudent but that wasn't your question.

It is possible but financially impractical to do so. Sell it and buy one with AWD.