Pohang Steelers seal double signing
The Steelers have also brought in highly coveted wing-back Ahn Tae-eun, the Asian Football Confederation said on its website.
Denilson, whose goals helped the Korean side finished third at last month's Club World Cup, moved to Uzbekistan's Bunyodkor along with strike partner Stevica Ristic.
Pohang's Brazilian coach Sergio Farias has also left the K-League side after capturing every domestic trophy at least once since taking control of the side in 2005.
Mota, who has scored 48 goals in 119 K-League matches during spells with Chunnam Dragons and Seongnam Ilhwa according to the AFC, joins after a spell with Brazilian side Ceara.
"I always wanted to come back to the K-League," Mota was quoted as saying. "I'm delighted it's with Pohang."
Former Korean Olympic international Ahn agreed to join the Steelers from FC Seoul after being linked with several clubs and despite interest from Japan.
Pohang were beaten 2-1 in the semi-finals of FIFA's Club World Cup by Argentina's Estudiantes.