In India, most of the pavements constructed are flexible in nature. Bituminous Concrete (Grade II) is the most common type of wearing coat used for Indian flexible pavement subjected to a design traffic of 5–50 msa. Bituminous concrete consists of a dense mixture of coarse aggregate, fine aggregate, fillers, and bitumen. One of the factors that affects the performance of bituminous concrete is the filler material, which is used to fill the voids between bigger aggregates in the mix and makes it impermeable. The filler material can influence the stability, strength, and stiffness of the mix. Most commonly used filler in BC mix is lime. In this study, conventional lime filler is replaced by Sugarcane Bagasse Ash (SBA) to evaluate the mechanical properties (Marshall stability, ITS and TSR value) of the mix. Sugarcane bagasse ash (SBA) is a waste product generated during the burning of sugarcane bagasse in sugar mills. First of all, Marshall mix design is carried out using conventional lime filler to find the optimum bitumen content (OBC) and comes out at 5.4%. Conventional lime filler was replaced with SBA at optimum bitumen content and varied as 25%, 50%, 75%, 100% of the conventional filler. The laboratory tests performed on conventional Bituminous Concrete and modified bituminous Concrete with SBA were Marshall stability test, indirect tensile strength test and Tensile Strength Ratio (TSR). After analyzing the result, it was observed that Marshall stability initially increases with increase in SBA up to 50% and after that Marshall stability starts to decrease. Indirect tensile strength of unconditioned sample is 3.6% more in conventional mixes and 12.09% more in modified mixes as compared to conditioned sample. TSR value of conventional mix is 8.6% more than modified mix that means SBA as filler has less moisture susceptibility than conventional lime filler.