A prosthetic abdomen for peritoneal dialysis training is provided. The prosthetic abdomen is in the form of a belt having an inner layer of material, an outer layer of material, and a pouch formed between the inner layer of material and the outer layer of material. A belt fastener is provided at one or both ends of the belt. The outer layer of material has an inner surface partially defining the pouch, and an outer surface having a skin tone color. The positioning of the belt and skin tone color can be selected to mimic the actual peritoneum of a patient. The pouch is expandable to hold a bag of liquid having a volume of at least 1000 milliliters (ml). A method of training a patient to carry out a peritoneal dialysis self-treatment, using the prosthetic abdomen, is also provided.