Soil pollution as a part of land degradation is caused by industrial activity, agricultural chemicals or improper disposal of wastes. Due to contamination there will be changes in both geotechnical as well as chemical property of soils. Sulphur contamination is one of the major pollution caused on both soils as well as in ground water, due to industrialization. Contamination due to sulphur causes lower pH, leaching of cations and also produces damages to concrete structures. The study deals with the effect of sulphur contamination in a clayey soil and a field contaminated sandy soil, and its remediation using Chitosan which is a natural by-product obtained from the sea food industry. The variation in geotechnical properties of contaminated clay was studied. From the study it was observed that the Atterberg limits, pH and UCC strength got reduced and coefficient of permeability got increased in the case of clayey soil while, chemical analysis test was performed on both contaminated and decontaminated field soil. The immobilization of sulphur content in these soils were carried out by the addition of a decontamination agent called Chitosan. The variation in geotechnical properties was also studied after decontamination. The removal efficiency of sulphur in soils was found by conducting Chemical analysis test and found that there is about 78% and 90% removal in clay and sand respectively.