We report a case of a 41-year-old man admitted with respiratory distress and found to have masses in both atria of the heart and in the testicle. The patient received palliative radiotherapy to relieving obstruction of blood flow tract caused by the intracardiac masses, followed by radical orchiectomy. After the diagnosis of testicular seminoma, he was treated successfully with 4 cycles of systemic chemotherapy. This is a rare case that presented with metastatic testicular seminoma involving both atria of heart and causing symptomatic obstruction of blood flow tract.