From the srd combat section as well where it is pretty clear you can get multiple attacks in a round. Nothing in the rogue section says that the sneak attack damage is limited to attack actions or added once onto a full attack action, it just mentions attacks the same way multiple attacks are mentioned in a full attack action.
STANDARD ACTIONS
Attack
Making an attack is a standard action.
Melee Attacks: With a normal melee weapon, you can strike any opponent within 5 feet. (Opponents within 5 feet are considered adjacent to you.) Some melee weapons have reach, as indicated in their descriptions. With a typical reach weapon, you can strike opponents 10 feet away, but you can’t strike adjacent foes (those within 5 feet).
Multiple Attacks: A character who can make more than one attack per round must use the full attack action (see Full-Round Actions, below) in order to get more than one attack.
FULL-ROUND ACTIONS
A full-round action requires an entire round to complete. Thus, it can’t be coupled with a standard or a move action, though if it does not involve moving any distance, you can take a 5-foot step.
Full Attack
If you get more than one attack per round because your base attack bonus is high enough, because you fight with two weapons or a double weapon or for some special reason you must use a full-round action to get your additional attacks. You do not need to specify the targets of your attacks ahead of time. You can see how the earlier attacks turn out before assigning the later ones.
The only movement you can take during a full attack is a 5-foot step. You may take the step before, after, or between your attacks.
If you get multiple attacks because your base attack bonus is high enough, you must make the attacks in order from highest bonus to lowest. If you are using two weapons, you can strike with either weapon first. If you are using a double weapon, you can strike with either part of the weapon first.
Deciding between an Attack or a Full Attack: After your first attack, you can decide to take a move action instead of making your remaining attacks, depending on how the first attack turns out. If you’ve already taken a 5-foot step, you can’t use your move action to move any distance, but you could still use a different kind of move action.