The rapid growth in development of construction industry is leading to an increase in utilization of natural resources like river sand due to which there has been a much scarcity of availability for construction. This overuse should be balanced by introducing certain abundantly available other natural materials which can be replaced to the river sand. The sea sand seems to have certain similar properties and can be used as a constituent of concrete. This can reduce the river sand replenishment and decrease various ecological imbalances. The fast growth in industrialization has resulted in tons and tons of by-product or waste materials, which can be fly ash, crushed stone dust, silica fume, and granulated blast furnace slag, steel slag etc. The use of these by-products not only helps to utilize these waste materials but also enhances the properties of concrete in fresh and hydrated states. In the present work, a series of tests were carried out to make comparative studies of various mechanical properties of concrete mixes prepared by using Sea Sand. If some of the materials are found suitable in the concrete making, cost of construction can be cut down. So in the present study, an attempt has been made to assess the suitability of Sea sand in concrete making. Cubes and beams were cast and tested for compressive strength and flexural strength after 7 days and 28 days. The Sea sand is replaced in percentages of 0%, 20%, 30%, 40%.