India thus finished the tournament with a silver and five bronze medal, gold eluding the country for a second successive edition.
Sachin was up against Uzbekistan's Samandar Kholmurodov and lost the bout in a unanimous verdict of 5-0.
Earlier, Ankit Kumar (60kg), Naveen Boora (69kg), Harshpreet Sahrawat (+91kg), Mohammed Etash Khan (56kg) and Sachin (75kg) had lost in the semifinals to settle for bronze medals.
The 17-year-old Sachin had the height advantage against Kholmurodov but was taken aback by the lightening pace at which his rival came at him.
The tournament featured 120 boxers from 23 countries.
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