Dear Saumia, Do let me know whether you want to have pleasure trip or party trip on the beaches. Also do let me know what is your budget and number of days you would like to stay.
My link is https://www.tripoto.com/profile/jagadishrao9895352. Regards, R. Jagadish Rao
Although Palolem beach is called one of the best beaches in Goa due to its white sand and cleanliness. but I would say explore COLVA BEACH which is a peaceful beach compared to others but give u all what u desire in Goa. It is beautiful beach when is comes to having long peaceful walks on the shores and also to spend time with family.
Morjim, Agonda, Colva are some scenic and beautiful beaches if you need some quite time.
Vagator and Palolem are other beaches which you might enjoy and are comparatively less crowded.
Go through arrambol and butterfly beach. they are isolated. and one more way to identify isolated beach is by studying shore of Goa through Google maps. try it. it would be more helpful then any others opinion.
In south Goa, you have so many beaches that are not so crowded and you can absolutely enjoy them.
I am listing some for you here:
1) Cano de Rama Beach
2) Mobor Beach
3) Sunset beach 4) Cola Beach - my favorite
5) Palolem Beach Do check them out and have a great trip :)