Nope...There is no PS2 emulator for the Wii. The Wii barely handles PSX emulation.
and if possible how can i do so.
You can run PS2 .iso games from hard disk only on PS2 or PS3 (backwards compatible models )
You can also run them through network streaming from PC
The software that does all that is called Open PS2 Loader
On the Wii or any other console..no..you can't run PS2 games