
Saethori |
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Give the party wizard a scroll of Animate Dead, then end your own life and have him raise you right after.
I mean, sure, you won't be a PC anymore, or even sentient, but you'll be undead!
If actual sentience is important to you, lich or vampire are the most attractive routes. You need to undergo one of a few different rituals for becoming a lich, with grave penalties for failing, but to become a vampire, you need only find another one.

Dragonchess Player |
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Contingency + create undead to come back as a mohrg (18th level caster). Or a mummy.

VRMH |
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A humanoid who dies of ghoul fever rises as a ghoul at the next midnight. A humanoid who becomes a ghoul in this way retains none of the abilities it possessed in life. It is not under the control of any other ghouls, but it hungers for the flesh of the living and behaves like a normal ghoul in all respects.
Ghouls are sentient, and - GM permitting - available as PCs. You'd lose your current Class Levels, but there's no reason you can't get new ones.

Tacticslion |

What about Ju Ju Zombies?
This.
Contingency this and bam: instant sentient undead with all of your class levels.
I did a breakdown of why this method was superior elsewhere (though I made a pretty critical math mistake), but I lack the time to post it now. I'll link it later, if I remember.