Concrete stands as the most extensively employed construction material globally, second only to water. The rapid escalation of urbanization and industrialization has fostered the excessive depletion of essential natural resources like river sand and gravels, resulting in pressing sustainability concerns. This scenario has underscored the need for viable alternatives to the fundamental components of concrete. Waste foundry sand (WFS), emerging as a byproduct of metal casting industries, emerges as a promising candidate for substituting natural sand within concrete formulations. Over the past few decades, an array of investigations has been conducted to delve into the impact of incorporating WFS as a partial or complete replacement for conventional sand in concrete compositions. Notably, it has proven viable for deployment as a partial sand substitute in structural-grade self-compacting concrete (SCC). The present chapter undertakes a comprehensive examination of numerous properties, revealing that the judicious integration of WFS augments both the durability and strength attributes of SCC up to a certain replacement threshold. However, concomitantly, this substitution leads to a reduction in the slump value as the replacement proportion of WFS escalates.