Growing grass on a sand base is challenging because sand is less dense, drying out faster than other soil types. If you amend the soil to make it more nutrient-rich and moist, the grass seed will take root quicker and more effective.
Clear debris such as sticks and stones from the planting location. Break up soil clumps that are larger than 1 inch in diameter. Grass seed needs to touch soil to germinate. It won't take root if there is too much debris.
Level the planting area to prevent dips, which cause water the pool. Add topsoil to low-lying spots and rake until smooth.
Loosen at least the top 4 inches of sand with a rototiller. The more air pockets present, the better the roots will spread.
Add nutrients to the sand base. Spread 6 inches of compost on top of the sand base to increase moisture.
Till the compost until it is well blended with the sand base. Make sure it is combined fully.
Lay down some starter seed fertilizer, following the instructions on the label. You can also use a product high in phosphorus. Mix the food into the top few inches of the amended sand.
Spread grass seed with a hand or mechanical spreader, depending on the size of the planting area. Spread it evenly to avoid gaps or overseeding.
Rake the seed gently into the amended soil and water until moist. Keep the soil moist by watering daily. Because the sand base lacks some nutrients, you need to pay it extra attention.