In light of the depletion of natural river sand (RS) and the detrimental impact on the environment of sand mining, manufactured sand has become an appealing and sustainable substitute for concrete manufacturing. In India, RS remains to be the highest source of fine aggregate for all construction activities. Uncontrolled sand mining removes the flora and fauna from the river system triggering the ground water table and even causing floods during rainy seasons. Using alternate sand can reduce the dependency on RS to promote sustainability goals. This study focuses on the development of sustainable Alkali-Resistant Glass Fibre Reinforced Concrete incorporating partial replacement of RS with manufactured sand. Experimental results demonstrate that the partial replacement of R sand by 60% with manufactured sand mix M60R40 enhances compressive strength, flexural strength and split tensile strength after 56-days by 11.7%, 23.5% and 22.19% with respected to control mix (M0R100), while maintaining acceptable workability. The inclusion of alkali-resistant glass fibres by 0.3% fibre content mix M60GF3 further improves compressive strength, flexural strength and split tensile strength by 9.36, 38.8%, and 19.1% with respect to M60R40 after 56-days. The findings suggest that inclusion of 0.3% Alkali-Resistant Glass Fibre offers a sustainable, eco-friendly alternative to conventional concrete.