Family Life What is Bank sand? What is Bank sand? Bank Sand is often used for filling low areas and raising elevation. It is good for filling lawn areas that are low since grass grows very well in this type of sand. This sand is recommended as a base layer to prep for grass installation. Related Posts:How to prevent and remove grass stains is one of the tips.Fertilizing a lawn with chicken safety in mind.Take care of your lawn.Do you have to put topsoil down before grass seed?