While it is true that twin are used to sharing a very snug sleep space in the womb, it's actually a safer idea to have them sleep apart once they are born.
They can certainly be in the same room, sleeping near each other (and staying up late talking when they are older), but babies sleep safer--and better--when they are not flailing arms or rolling into each other. While the AAP does not specifically address twins in their safe sleep policy statement, the AAP recommendation is that an infant should have his own sleep space so there is not a risk of suffocation, smothering, or entrapment.
And from a practical standpoint, one baby is less likely to wake up the other one if they are not right next to each other. And every moment of precious sleep will count when you are dealing with two infants in your house.