After his three-wicket haul with the ball, Gokul (51) scored an unbeaten half-century to guide Assam to the historic win at the Y S Rajasekhara Reddy ACA-VDCA Cricket Stadium.
Opting to ball, Assam first dismissed Kerala for 197 in 48.5 overs and then overwhelmed the target with five wickets in hand and 24 balls to spare.
Assam will take on Delhi in the summit clash tomorrow. Delhi beat defending champions Bengal by six wickets in the first semi-final earlier in the day.
Only three Kerala batsman managed double digit scores with opener VA Jagadeesh top-scoring with a fighting 89 off 109 balls. Besides Jagadeesh, Raiphi Gomez (51) and Rohan Prem (34) were the other contributors with the bat for Kerala.
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Chasing the modest target, Assam were in for early jolt as they lost their first three wickets for just 28 runs before Tarjinder Singh (49) and opener Pallav Kumar Das (37) steadied the ship with a 72-run fourth-wicket stand.
But Gokul and Jamaluddin Syed Mohammad stitched unbeaten 75 runs for the sixth wicket to guide Assam home.
Brief Scores:
Kerala: 197 all out in 48.5 overs (V A Jagadeesh 89, Raiphi Gomez 51; Gokul Sharma 3/30, Pritam Das 3/38).
Assam: 200 for 5 in 46 overs (Gokul Sharma 52 not out, Tarjinder Singh 49; Prasanth Parameswaran 2/25, S Sandeep Warrier 2/25).