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Soil ecoacoustics is an emerging field and suite of tools that use sound and vibration to detect belowground biological activity. It offers a minimally invasive way to assess soil communities and ecosystem processes. Across biomes, we found that soil ecoacoustics is being used to detect organisms, quantify animal behaviour, monitor soil health, and assess restoration interventions. In this review, we show that ecoacoustic metrics reflect changes in soil fauna activity, disturbance impacts, and recovery trajectories. However, major challenges remain, including inconsistent terminology, limited understanding of sound propagation across soil types, difficulty separating biotic from abiotic signals, and a lack of standardised methods. Thus, we propose foundational standard operating procedures (SOPs) and identify how soil ecoacoustics could be integrated into global biodiversity monitoring frameworks.