Try to get the non-specific amplicon by reducing the annealing temparature and extract from gel , purify and send for sequencing or clone into a vector by TA cloning and send for sequencing. But this method does not solve your problem. I suggest you to design new primer pair and repeat the PCR.

1) You can try gradient PCR to see which annealing temperature gives you the band of interest without non-specific bands

2) Put no more than 250ng of DNA template in a total reaction volume of 50ul, too much DNA will affect amplification as well

3) Check the integrity of DNA by running on gel to ensure the DNA is good in quality before proceed

4) If all above don't work, design a new pair of primers

may be this problem is arising due to template concentration.

in my case i got sear due to high template concentration.

how much template concentration u are using???