A significant number of transportation embankments fail before their design life due to poor quality of construction materials, inadequate compaction, embankment construction, and overloading. To overcome this issue, increasing the strength and rigidity of the embankment layers is necessary to lower the stresses on the sub-layers. This paper aims to advance the knowledge of using multilayer geosynthetic reinforcements to improve the performance of sandy embankments. Four laboratory model tests with reinforced and unreinforced embankment were conducted in a box of inner dimensions of 2.40(L)×1.15(W)×1.20(H) m. Local poorly graded sand (A3 soil) was used as fill material to construct a 450 mm high embankment with a 1:1 side slope resting on a 300 mm high of sandy subgrade soil. In the reinforced embankments, three layers with 150 mm vertical spacing of either geotextile, geogrid, or geocomposite (i.e., geotextile sheet over geogrid) were utilized in each model test. Several non-distractive tests, e.g., lightweight deflectometer, dynamic cone penetration, and field California bearing ratio tests, were performed during the embankment construction. In each test, two static plate loading tests were conducted to evaluate the embankment performance and the benefit of geosynthetic reinforcement. The study showed that geosynthetic reinforcement significantly decreased surface settlement and increased load-carrying capacity. The results indicate that the load-carrying capacity near the embankment side slope can be significantly increased by the inclusion of geosynthetic layers and that the magnitude of capacity increase depends greatly on the geosynthetic type. The results also demonstrate that geogrid lateral restrain and confinement were more effective alternatives to sublayer improvement than geotextile or geocomposite.