How can I get traffic to it from FB?

I have a website at Sports niche. So i would like to know how can I get traffic to it from FB pages?

ladkabell is right. Join relevant groups - as many as you can. Share your content to your groups. Build your own page or group as well and post really good engaging stuff, and of course share your content too. Good stuff will result to high fan engagement in your page. You can try ads too, especially if you want targeted traffic.

Create a page on Fb that is about your site, share stuff you make on your site on the page and after that share stuff from that page on a lot of groups that are in the same niche. Sharing a post instead of just posting to groups will give better results and a lot more people will click the link. Also make sure that what you post in interesting and you could be driving quite a lot of traffic towards your site.
Also, join enough groups so you don't share on the same groups each day but cycle through them.

Go after viral topics and try to attack it. IE: NBA Finals, World Cup, etc.

Posting link on Facebook page is the great way to driving traffic to your site.