In 2015, men's doubles national coach Herry Iman Pierngadi paired Sukamuljo with Marcus Fernaldi Gideon, because Selvanus Geh had to resign from the national team due to illness. The new partnership opened the season in Europe playing at the All England and Swiss Open. In England they reached the quarterfinals before falling to the Danish pair Mads Conrad-Petersen and Mads Pieler Kolding, Partnered with Greysia Polii, Sukamuljo lost in the second round of mixed double to fifth seeds Chris and Gabby Adcock. In Switzerland, he and Gideon were stopped in the semi-finals by the Malaysian pair Goh V Shem and Tan Wee Kiong. Sukamuljo then took part in the Sudirman Cup held in Dongguan, China, where Indonesia settled for a bronze medal. At the June Southeast Asian Games in Singapore, he helped his team win the gold medal, and in the individual men's doubles event, he and Gideon captured the silver medal.