How to access internet using bsnl type 2 modem without using ethernet cable to my Desktop


Hi, I have bsnl broadband connection with type 2 modem which is WIFI enabled. Right now the modem is connected to my desktop PC through Ethernet cable. This requires long cables ( either Ethernet cable or telephone cable) if i had to move my PC into my room.So i wanted to know how would i use my PC to connect to internet from my room using WIFI (just like a laptop). I do not want big cables running all around my house. Do i need to get additional hardware for that ?Please help me.Thank u. :)