沈光漢發跡於粵軍第一師。1925年粵軍第一師改編為國民革命軍第四軍，沈光漢仍為其中擔任高級指揮官。北伐中第四軍屢有戰果，於中原大戰擊敗馮玉祥及閻錫山後擴編為十九路軍，蔣光鼐為總指揮，蔡廷鍇為軍長，沈光漢升任中將統帥60師。1931年九一八事變後，十九路軍調防上海，同時蔣介石受壓下野，南京政府由廣東派系主持，陳銘樞任京滬戍衛師令。1932年一二八事變，日本派陸戰隊登陸上海。沈光漢率十九路軍第60師奮起迎戰抵抗，因而成為聲名大噪嘅抗日軍隊。也因此，任該師總指揮嘅沈光漢也獲頒青天白日勳章。後來日本多番增援；蔣介石復出後，國軍亦派出中央軍共同作戰，最後事件以外交談判解決。1933年11月20日，閩變正式爆發，之後，蔣介石調八個師的陸軍入閩，他依附蔣中正，並宣佈擁護南京中央。該聲明為蔣中正平息閩變主因之一。之後，十九路軍的番號取消，部隊亦被分散收編，他仍任師長。抗戰時期，曾任軍事參議院參議；抗戰勝利後，三十五年（1946）以後被選爲第一屆國民大會代表，也曾任私立德業小學校長。1949年後定居香港，並於1972年11月29日在此病逝，終年八十五歲。
Shen Guanghan came from the First Division of the Guangdong Army. In 1925, the First Division of the Guangdong Army was reorganized into the Fourth Army of the National Revolutionary Army, and Shen Guanghan was still the senior commander among them. In the Northern Expedition, the Fourth Army had many successes, and after defeating Feng Yuxiang and Yan Xishan in the Central Plains War, it was expanded into the 19th Route Army, with Jiang Guangyun as the commander-in-chief, Cai Tingyun as the army commander, and Shen Guanghan promoted to lieutenant general to command the 60th Division. After the 918 Incident in 1931, the 19th Route Army was transferred to Shanghai, and at the same time, Chiang Kai-shek was pressed into the wilderness, and the Nanjing government was presided over by the Guangdong faction, and Chen Mingshu was appointed as the commander of the Beijing-Shanghai garrison. In 1932, the 128 Incident occurred, and Japan sent marines to land in Shanghai. Shen Guanghan led the 60th Division of the 19th Route Army to meet the resistance, so it became a well-known anti-Japanese army. For this reason, Shen Guanghan, who served as the commander-in-chief of the division, was also awarded the Order of the Blue Sky and White Sun. Later, Japan reinforced more; after Chiang Kai-shek's return, the Nationalist Army also sent the Central Army to fight together, and the incident was finally resolved through diplomatic negotiations. On November 20, 1933, the Min Mutiny officially broke out, after which Chiang Kai-shek transferred eight divisions of the army into Fujian, he attached himself to Chiang Zhongzheng, and declared his support for the Nanjing Central Committee. This statement was one of the main reasons for Jiang Zhongzheng's quelling of the Fujian rebellion. After that, the number of the 19th Route Army was cancelled, and the troops were dispersed and integrated, but he remained the division commander. After the victory of the Anti-Japanese War, he was elected as a representative of the first National Assembly thirty-five years later (1946), and also served as the principal of the private Deye Primary School. He settled in Hong Kong in 1949 and died there on 29 November 1972 at the age of 85.