Sueoka joins Pune FC after spending the previous season with East Bengal, while Sabrosa has spent the last season with Mohammedan Sporting.
Both players bring in their long-standing experience of the Indian circuit and are the first foreign recruits to be signed under new coach Karim Bencherifa.
Incidentally the duo was also part of the Salgaocar FC side which won the I-League under Bencherifa in 2011-12, the club stated in a media release.
The club's operations head, Chirag Tanna, said: "We are very glad to have signed Ryuji and Luciano for the 2014-15 season. Both players have won the I-League and Federation Cup and that experience will be invaluable to our young squad."
Sueoka will be the third Japanese player to play for Pune FC after Arata Izumi (2009-12) and Daisuke Nishiguchi (2012-13) while Sabrosa is the second Brazilian after Edmar Figueira (2009-11) to wear the club's colours.