Sorption characteristics of ⁶⁰Co, ⁸⁵Sr and ¹³⁷Cs onto sandy soil are studied experimentally. Sorption kinetics and distribution coefficients at a quasi-equilibrium are investigated. Sorption strength among 3 species is explained with sorption mechanism and surface complexation concept. A sequential chemical extraction method is introduced to find out sorption modes and reversibility. Chosen reagents for extraction are groundwater, CaCl₂, KCl, and KTOX(K₂C₂O₄+NH₂OH-HCl). Considered sorption types are reversible sorption in a groundwater condition, ion exchange, association with ferro-maganese oxides, and irreversible fixation. Strontium sorbed onto the sandy soil surface mainly by fast and reversible ion exchange reaction. However, cobalt and cesium ions do not sorb by a simple process. In the case of cobalt, three kinds of sorption types were occurred competitively among ion exchange, association with ferro-manganese oxides and irreversible fixation. The main sorptive binding of cesium was ion exchange reaction, while irreversible fixation was the secondary importance. The order of migration mobility for the three radionuclides was ⁸⁵Sr>⁶⁰Co>¹³⁷Cs in the sandy soil.