The present paper mainly aims to investigate the behaviour of sandy soil ground due to an excavation under plane strain conditions. Numerical analyses were carried out for the supported excavation of size 10 m × 2 m in homogeneous sandy soil using PLAXIS3D. In the analysis, the behaviour of soil was simulated by using a hardening soil model, and behaviour of a retaining wall was assumed as a linear elastic material. The numerical results were analyzed to find out the extent to which the ground condition is getting modified due to excavations. The analysis results showed that the embedment depth of the sheet pile wall reduced the ground movements up to 55.05% and had a greater influence when compared to other parameters considered. A comparison with an additional support system along with the sheet pile wall yielded a 99% reduction in ground movements. The magnitude to which the thickness of the retaining wall, its proportions, and its efficiency influence the ground behaviour due to excavations are discussed in the paper.