Hi,
I'm guessing you mean House Sparrows - they can be a real problem. Get rid of the seed mix and switch to black-oil sunflower seed. I've never seen House Sparrows eat it, but plenty of other species love the sunflowers. For "good" sparrows and other seed eating birds try white millet; and for nuthatches and several other species get a peanut feeder. This should also pretty much get rid of starlings as well. Hope this helps.