As reinforced earth walls are more durable and aesthetically better finished when compared to conventional retaining walls, the flexible nature of reinforced earth mass enables a reinforced earth wall to withstand large differential settlements without distress. Reinforced earth walls are consequently economical when the height of the structure is large or ground conditions are unfavorable and suitable backfill materials are locally available. The main objective of the research is to evaluate the feasibility of dune sand as a sustainable fill material for reinforced earth walls through the infusion of synthetic reinforcement at suitable positions. Dune sand from Jaisalmer district, Rajasthan, is used as a backfill material for reinforced earth walls. For this purpose, load settlement and load–displacement tests were carried out on Dune sand and River Sand, with a mix proportion of 1(DS):1(RS), 1.5(DS):1(RS), and 2(DS):1(RS) using a large-scale model test setup. To measure the displacement and settlement, dial gauges were set up in the RE wall model to measure the vertical settlement of the backfill material and the lateral displacement of the RE wall. The vertical pressure distribution at the base of the RE wall using three different methods: Uniform pressure distribution, Trapezoidal pressure distribution, and Meyerhof’s pressure distribution, Vertical stress distribution on horizontal and vertical planes, active earth pressure were calculated for the justification of the experimental results. The results depicted a mixture of 1(Dune Sand):1(River Sand) to be satisfactory. With the increase in the percentage of dune sand in the backfill, the composition shows an increase in lateral displacement. The vertical settlement of 2(Dune Sand):1(River Sand) is much less compared to other proportions.