Sideboard Help

[Killin88]

So basically I never played anyone but friends until yesterday and theyed use basically MY DECK :
4x {Entreat the Angels}
4x {Tamiyo, the moon sage}
2x {Jace, Archetect of thought}
1x {Angel of serinity }
4x {thought scour}
4x {think twice}
4x {supreme verdict}
4x {Terminus}
4x {feeling of dread}
4x {temporal mastery}
8x {plains}
13x {island}
4x {glacial fortress}

Anyway I need a sideboard to face other control.
One extra question is can I sideboard land?

[Monrodesign]

Ya, a lot of control decks sideboard in {Cavern of Souls} in the mirror match.