You need a wireless access point (WAP). The router may be a WAP. Generally the easiest way to tell is if you see an antenna or a connection for where one should go on the router. If your router is not a WAP then you need another solution such as a different router with WAP or the addition of a separate WAP to the network.
If you can provide more details such as router make and laptop make I can give you a more specific answer.