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There are several possible reasons why your Bermuda grass is not thick, with the biggest reasons being too little water, too much shade, compacted soil, drainage issues, and too few nutrients in the soil. Bermuda grass needs frequent and direct sunlight to stay thick, so thinning grass is likely the result of a lack of sun. 

Yes, you can put topsoil over sand to encourage grass growth. The topsoil will help to improve water retention and promote grass roots’ development, making it a recommended step of the seeding process. Adding a layer of topsoil will provide additional nutrients to the sandy soil, helping the grass grow and remain healthy through many seasons.

Yes, Bahia grass spreads on its own thanks to its short stolon system. However, it might not seem like your Bahia grass spreads well due to its slow growth. Bahia grass takes around 3 to 4 weeks to germinate and an additional two weeks to grow thicker. 

During this time, fast-growing, competitive weeds may pop up, so weed your lawn to give your Bahia grass a chance to grow. This grass can take up to two years to become established. Once established, Bahia grass typically does well in suitable climates.

Properly preparing the soil for planting grass seed may include applying fertilizer several weeks before spreading the seed if you plan to overseed the lawn. However, in most cases involving a brand-new lawn, spreading a starter fertilizer along with the grass seed will give it the best chance of taking root quickly and growing strong.