Personally, I think the technique is brute force, but, hey, you want to do it!

interrupt:

do whatever....

pop a
pop a ;remove return address off the stack
clr a
push a
push a ;push return address of 0x0000 onto the stack
reti ;this will return to address 0x0000

If you'd done some reading, this would have been obvious!
Remember jumping to address 0x0000 is not the same as doing a reset!

As Abhishek mentioned, enable the watchdog. To reboot the micro, just have your code sit in a dead loop and the watchdog will bail you out.