This study reports the experimental study conducted to evaluate the impact of fibre reinforcement on poorly graded sandy soil stabilized with fly ash and cement. A series of test specimens were prepared by adding 30% fly ash and varying percentages of glass fibres and cement. In this study, 30% fly ash, cement percentages of 0.5%, 1%, 1.5%, and 2% and fibre percentage of 0.25%, 0.5%, 0.75%, and 1% were adopted. Laboratory experiments such as compaction, unconfined compressive strength, and unconsolidated undrained triaxial tests were performed on the mixed specimens. The results indicated that the addition of fly ash and cement enhanced the compressive strength of the soil mixture although it also led to a slight increase in brittleness. Incorporating fibres into the treated soil further improved the strength and contributed to a more ductile response in the samples. The energy absorption properties of the soil composite were determined. It was observed that fly ash, cement, and fibre collectively played a significant role in increasing the energy absorption property of the soil.