The performance of a large piled-raft foundations on sand subjected to four column loads was carried out with the help of three-dimensional finite element software Plaxis 3D. The effect of varying the raft thickness and pile length on the load sharing ratio considering both uniform pile arrangement and concentrated pile arrangement schemes in both medium sand and dense sand conditions were studied. The behavior of sand was modeled using Hardening Soil material model. The raft thickness varied in such a way that the stiffness ranged from flexible to extremely rigid. The piled raft of size 25 × 25 m with pile length varying as 20, 30, 40, 50 times the pile diameter of 0.5 m was considered. Based on the study, as the thickness of raft increases from 0.7 to 4.7 m, the load sharing ratio is found to decrease for uniform arrangement of piles for both medium sand and dense sand conditions. Similar result is also observed for concentrated arrangement of piles. For all the three raft thicknesses, the load sharing ratio for concentrated arrangement of piles is lesser compared to the uniform arrangement of piles. The load sharing ratio increases as the pile length increases for concentrated pile arrangement case, which is expected. There is not much of a significant difference in load sharing ratio between medium sand and dense sand conditions for both uniform and concentrated pile arrangement schemes.