You can't go to Sinnoh in the Gen V games.
back to sinnoh
No there is no way to get to Sinnoh.
No. You cannot go to any of the previous regions in this game.
you start out in sinnoh -_- you start out in Johto... And no you cant go to sinnoh but you can get the Pokemon by playing sinnoh tunes ;D
I think your talking about HeartGold/SoulSilver. In Pokemon HeartGold/SoulSilver you're not capable of going to the Sinnoh region, only Jhoto and Kanto are avaliable.
you can't go to sinnoh in Pokemon soul silver.
you cant go to sinnoh you have to stay in that regin
Honestly Sinnoh is a place you are stating it as it is a pokemon? Id advise you to say how do you get TO sinnoh. But no you can not go to sinnoh nor can you go to kanto from sinnoh. But in heartgold you can go to Johto.