'Sandbank' was a British support undertaking by parties of the Small Operations Group (Special Boat Section) for the crossings of the Chindwin river at Sittaung, Mawlaik and Kalewa, in the north-western part of Japanese-occupied Burma, by the leading elements of Lieutenant General M. G. N. Stopford’s Indian XXXIII Corps of Lieutenant General Sir William Slim’s British 14^th Army (December 1944).

The undertaking was part of the British and Indian 'Extended Capital' advance, after the failure of the Japanese 'U', from Imphal toward the Irrawaddy river and the primary targets of Mandalay and Meiktila.