Ishan Kishan top-scored for India with 49 as Men in Blue made 190/7 in 20 overs.
Bethell remained unbeaten on 76 off 46 balls to take England over the line in the chase of 191.
India lost their final Group A fixture to Australia and were knocked out of the tournament.
India and Australia faced off in a must-win game for Harmanpreet and co.
Sanju Samson was dropped after scoring 6 runs in his last three T20I innings.
Sooryavanshi is yet to make his India debut despite everyone waiting to see him in Blue colors.