Sparrow mud bathing in newly seeded bed

Hi. 

While I absolutely love having birds in my garden & do lots to accommodate nature, I have recently sowed some wildflower seeds in a newly prepped border but the sparrows have decided it’s the perfect spot to mud bathe!! 

Any suggestions of how I can prevent this ? I know there’s bird netting but is it safe for them?? I want an option that won’t cause harm or injury in any way.