Researchers have investigated the effects of flooding on soil, particularly focusing on how short-term ponding influences soil aggregation and soil–water chemistry. They found that alternate wetting and drying significantly impact soil properties. In flooded soils, a range of toxic substances can accumulate [1–3]. This study aimed to assess how pH and organic matter influence Cadmium (Cd) mobility in different soils under alternate wetting and drying conditions. The research examined Cd behavior in laterite soil, marine clay, and beach sand over a 24-day period, considering both flooded and unflooded conditions, and the role of organic matter in Cd mobility. Findings revealed that in acidic soils, pH increased with flooding, with longer flooding periods leading to higher pH levels. The presence of soil organic matter and clay content significantly influenced Cd solubility, with organic matter reducing Cd in porewater, especially in laterite soil. The complex nature of soil makes it challenging to generalize Cd sorption and availability.