Is there a magic weapon property that will increase sneak attack damage?

[shaxberd]

I thought there was one, but I can't seem to find it in any of my books. If anyone can help me out, please let me know the name of the item and what book I can find it in. If you know of other types of magic items that do the same thing, please let me know that as well. Thanks in advance.

[wraithstrike]

I think there are some in Ultimate Equipment, but they have other affects. I would go to the PRD and open up the magical weapon section and the wondrous item section, and use the search feature in your browser by typing in sneak attack.

edit: I don't think there is a magical weapon property that does this but there may be magical items. I misread your post.

[Durngrun Stonebreaker]

Sword of Subtlety

[Charon's Little Helper]

There's also the sneaky enchantment which lets you sneak attack more often. (costs 5000 a weapon)

[Imbicatus]

Flaming, Icy, Shocking, and Corrosive add 1d6 each, and they even work if something is concealed, amorphous, or immune to crits.

[Rerednaw]

To the OP out of curiosity which class/build are we talking about?

Some classes that have sneak attack have accuracy concerns. A flat +1 enchant that increases your chance to hit may or may not be more helpful than another d6.

[shaxberd]

I'm playing a rogue that's somewhat reliant on Offensive Defense to avoid getting hit in melee. I'm looking for more sneak attack dice so I can increase my dodge bonus to AC on targets I use sneak attack against. I also use Sap Adept and Sap Mastery so it may even count as 2d6 nonlethal, depending on how my GM rules it.

[Joynt Jezebel]

There is the ring of swarm of stabs that adds 1d6 to sneak attack damage. Its not a weapon but is close to what ur looking for.