You can get to Sava Center by Bus or Tram.
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These are the lines and routes that have stops nearby Sava Center:

Tram lines:
7 (Ustanička - Blok 45)
9 (Banjica - Blok 45)
11 (Tadeuša Košćuška - Blok 45)
13 (Banovo Brdo - Blok 45)

Bus lines:
17 (Konjarnik - Zemun Gornji Grad)
18 (Medaković 3 - Zemun Bačka)
68 (Zeleni Venac - Blok 70)
70 (IKEA - Bežanijska Kosa)
74 (Mirijevo 3 - Bežanisjka Kosa)
88 (Novi Železnik - Kej Oslobođenja)
95 (Borča 3 - Blok 45)
605 (Savski Trg - Surčin)
EKO1 (Vukov spomenik - Belvil) - electric bus
E1 (Bulevar kralja Aleksandra - Blok 45)
E6 (Mirijevo 4 - Blok 45)
ADA5 (Ada Ciganlija - Bežanijska Kosa) - only during the summer