The junior World Championship bronze-medallist was up against Asian youth bronze-winner Carlo Paalam of Philippines and the Indian triumphed 4-1 to enter the summit clash.
He will tomorrow face Cuba's reigning national champion Jorge Grinan, who pulled through a tough contest against American Dylan Prince to win 4-1.
Sachin, who is also an Asian Youth Championships quarterfinalist besides being the reigning junior champion, relied on his power-packed left jabs to unnerve the Filipino.
Although Paalam's right straights were bang on target on most occasions, Sachin was easily fending off his challenge for a majority of the bout by swiftly swaying back.
The 16-year-old Indian's speed and reflexes were hard to match for Paalam, who was repeatedly thrown off balance in his attempts to connect punches.
Vikas Krishan was the last Indian boxer to win a gold at these Championships when he finished on top in the 2010 edition.
(REOPENS SPD 14)
However, in the 91kg category, Naman Tanwar lost to Cuba's Dainier Christian Period 0-5 to settle for a bronze medal.
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