On 29 April 2008, Sinagra joined the Italy national beach soccer team for the FIFA Beach Soccer World Cup qualification which was held from 11 to 18 May in Spain. On 12 May, he made his debut in the national team in the match against Greece. Sinagra played four matches in the Beach Soccer World Cup's qualification and eventually placed Italy fourth, qualifying for the World Cup. In June 2008, he left Venafro and he was bought by a beach soccer team, A.S.D. Mare di Roma. He made his debut in Beach Soccer's Serie A on 27 June 2008 in the match against Alma Juventus Fano, scoring a goal. He scored six goals in three matches for Mare di Roma, convincing Italy's coach Giancarlo Magrini to include him in the squad for the 2008 FIFA Beach Soccer World Cup.