Dermatofibrosarcoma protuberans is a rare fibroblastic mesenchymal skin tumor with low-grade malignancy and occasional distant metastasis. Most cases involve the trunk, extremities, scalp, and neck. In rare cases, the genital urinary system may be affected. Diagnostic tools include computed tomography and magnetic resonance imaging. The standard treatment of wide-margin surgical excision with a clear margin of 3~4 cm may be problematic in large tumors or in some areas of the body, as a radical excision may produce unacceptable cosmetic, structural, or functional results. An unresected or positive margin should be treated with adjuvant radiotherapy to help prevent recurrence. Chemotherapy plays a limited role in treating this disease. This article describes a middle-aged male with a large, suprapubic abdominal tumor who underwent total excision and pedicle groin flap transfer to cover the large skin defect. After undergoing postoperative adjuvant radiotherapy, the patient was tumor-free at 1 year of follow-up.