not sure what you mean but all motherbd come with pcie and usb so yeah in that sense it supports wireless networking. Bring your own wireless card/stick.
If you meant does it have it "built-in": no it does not.
I'm modifying a computer that has a big box named WLAN in the back of it. The only connectors it has are small,flimsy wires with gold circle-like connectors on the end.
If that wont work, any suggestion for a good networking card?