Well, yes if you think you can

Seriously thoug, which movement are you talking about? Are you talking about the whole sonata? Because in that case, the first and third movement will have its challenges, though not impossible at grade 8. For example, the first movement has some big chords that are difficult for someone like me who has relatively small hands. The third movement is technically the most difficult one. Some fast arpeggios and scales, but if you practise your arpeggios and scales in all keys it will be manageble. The second movement shouldn't technically be a problem at all, though it is one of the most beautiful sonata movements in history, so musically its very demanding, but if you have the music inside you and can express your love for it, the piece is perfect..
How about trying the second movement of the D959 Sonata (also in A major)? It actually isn't as difficult as it sounds(though the middle section needs some pracitce, but once again it is only arpeggios and scales pretty much), and it is beautiful piece of music and sounds impressing technically too if that's important to you

Once again it is musically very very difficult though, and shouldn't really be played if you don't have a real connection to it...
Cheers!