Ordinary Portland cement (OPC) production raises environmental concerns due to high energy consumption and CO2 emissions. Geopolymer concrete (GC) emerges as a sustainable alternative utilizing industrial by-products like Ground Granulated Blast Furnace Slag (GGBFS) and Metakaolin (MK) activated by alkaline solutions. This study investigates Self-Compacting Geopolymer Concrete (SCGC) development using GGBFS/MK blends and superplasticizers for improved workability. Fresh properties were evaluated through Slump flow, V-Funnel, T-50 slump flow, and L-Box tests. Compressive strength served as the primary indicator of mechanical properties. Metakaolin content influenced workability, with a notable decrease in slump flow at a 30% replacement rate. Water absorption tests revealed variations in concrete quality based on GGBFS/MK ratios. At 90 days, higher replacement of metakaolin resulted in decreased compressive strength of around 12.63% for mix 4, whereas water absorption decreased with lower replacement levels of metakaolin, i.e., around 1.8% for mix 1. The study highlights the potential for enhanced strength through denser microstructure and reduced absorption. It contributes to the development of sustainable construction materials while promoting improved concrete performance for various applications.