The piled raft foundation (PRF) system is proven to be an effective solution for high-rise buildings. These foundations have a more significant effect on both total and differential settlement, which in turn improves the stability of the structure. Analysis of PRF using soil springs is a popular approach for practicing engineers. In a simplified model, the response of a PRF is strongly influenced by the behavior of the underlying soil, specifically by the subgrade modulus. Studies on the subgrade modulus of the PRF under combined vertical, horizontal, and moment (V-H-M) loading are limited. This study examines the effect of V-H-M loading on the distribution of subgrade modulus below raft. A three-dimensional (3D) numerical analysis of PRF comprising of 3 × 3 pile configuration embedded in sand is performed using Finite Element Analysis (FEA). Soil is modelled as 3D continua and its behaviour is simulated using the Mohr–Coulomb constitutive model. The subgrade modulus at the base of the raft is estimated from the 3D FEA by dividing the contact pressure at the desired point of the raft by the displacement at that point. The subgrade modulus in lateral and vertical directions for raft are examined considering V-H-M loading and compared with values when only vertical and horizontal loads are applied.