The flagship handset has already moved 20 million units since its release three months ago, and Samsung Mobile head JK Shin has targeted a further 10 million sales by the end of the next quarter.
Samsung's Galaxy S3 is expected to face stiff competition from Apple's next smartphone, with one analyst tipping the iPhone 5 to shift 6 million units in its first weekend on the market.
Shin also expects Samsung's hybrid tablet the Galaxy Note 2 to sell more than 20 million units, double the figure of the original Galaxy Note, according to Korean news agency Yonshap.
The rivalry between Samsung and Apple has grown increasingly bitter over the last year. Reports earlier today suggest that the former could move to have the iPhone 5 banned from sale over allegations that it violates its 4G patents.
Apple successfully sued Samsung for $1.05 billion last month after a jury found that the firm had copied critical features of the iPhone and iPad for its mobile devices.