Understanding movement patterns in sharks is essential for habitat use, identifying critical habitats, and determining how populations respond to anthropogenic change. Fine-scale movement data can provide valuable insights into these ecological processes and their environmental drivers. Gummy sharks (Mustelus antarcticus) are small, demersal sharks distributed throughout southeastern Australia. They are a targeted species in the Southern and Eastern Scalefish and Shark Fishery (SESSF) and function as key mesopredators within marine ecosystems. Despite their ecological and fisheries importance, the drivers of their movement and their critical habitat requirements remain poorly understood. This study used pop-up satellite archival tags (PSATs) to investigate the horizontal and vertical movement patterns of gummy sharks in southeastern Australia (n = 5). Tagged individuals exhibited extensive horizontal movements across the region, characterised predominantly by highly transient, directional movements, with mean movement rates of approximately 30 km day-1, mean displacement exceeding 140 km, and maximum displacement exceeding 300 km. Reduced movement and directionality were occasionally observed in 3 sharks, potentially indicating localised searching behaviour. Vertical movement patterns suggested a preference for depths of approximately 50 m; however, depth use varied both temporally and among individuals. Our study provides the first application of satellite telemetry to investigate gummy shark movement ecology, addressing key knowledge gaps in the spatial ecology of this commercially and ecologically important species. Further use of such technology can provide a basis for informing sustainable management for the species and other demersal sharks under changing environmental conditions.