 After World War I, Asama was used primarily for long range oceanic navigation training by officer candidates. On 21 August 1920, she began a training voyage to South America and Polynesia that lasted until 2 April 1921. She was re-designated a 1st class coast defense ship on 1 September 1921. In 1922, all of her main deck guns, six 6-inch and four 12-pounder guns, were removed and their casemates plated over. In addition all of her QF 2.5-pounder guns were removed and a single 8 cm / 40 3rd Year Type anti-aircraft gun was added.
