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Periwinkle shells are waste products derived from Periwinkles. They can be recycled and processed either as fine aggregate, coarse aggregate, filler, or cement replacement. This study investigates crushed periwinkle shells' suitability as an alternate material for natural sand in sandcrete hollow blocks for sustainable infrastructure. Tests, including the chemical compositions and physical properties of the natural sand and periwinkle shells aggregate materials, were investigated. In addition, mechanical properties such as compressive strength, density, and water absorption of the sandcrete blocks using periwinkle shells as a replacement for sand at 5%, 10%, 30%, and 50% were evaluated. The result of 28 days compressive strength of sandcrete hollow blocks showed that 5%, 10 %, and 30% periwinkle shell partial replacement met the minimum requirement recommended for compressive strength for non-load bearing blocks by Nigeria Industrial Standard (NIS 87: 2000) specification. Also, 28 days bulk densities result of sandcrete hollow blocks ranged between 1860.97 and 2008.10 Kg/m3. The water absorption tendency of the sandcrete blocks reduces as the dosages of periwinkle increase from 0 to 30%. Utilising periwinkle as a replacement for fine natural aggregate will enhance green products' promotion for sustainable infrastructure and reduce the periwinkle pollution menace. Maximising waste periwinkle shells will foster the actualisation of the United Nations Sustainable Development Goals.