Kammala wannan jumla: Yin tafiya zuwa matakin U20, Reinhart ya sami wuri tare da 'yan wasan matasa na kasa don
Gasar Zakarun Duniya ta 2014. Dan uwansa Griffin shima ya shiga kungiyar, kuma sun zama 'yan uwan biyu na uku da suka buga wa Kanada wasa a Gasar Zakarun Duniya. Reinhart da Aaron Ekblad su ne kawai 'yan wasan biyu a cikin jerin' yan wasan Kanada da suka cancanci shiga gasar NHL ta 2014. Reinhart ya zira kwallaye biyu da taimako uku a wasanni uku na farko na gasar, amma ba a ci nasara ba har zuwa karshen gasar. Kanada ta rasa wasan lambar tagulla da Rasha 2<unk>1 kuma ta gama ta huɗu. Sam Reinhart ya kuma wakilci Team Canada a Gasar Hockey ta Junior ta Duniya ta 2015. Kungiyar ta lashe zinare yayin da Sam ya kasance daya daga cikin kyaftin din biyu na tawagar, ɗayan kuma Connor McDavid. Reinhart ya zira kwallaye a wasan da ya lashe wasan da kungiyar Rasha a wasan zinare, wanda shi ne na biyar a gasar. Reinhart ya gama da jimlar kwallaye 5 da maki 11 yana jagorantar dukkan 'yan wasa a cikin kwallaye da maki.