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The 2nd law of thermodynamics states "The entropy of any isolated system not in thermal equilibrium almost always increases". That means that energy is dissipated over an isolated system. Organisms require energy to sustain themselves enough for genetic drift and natural selection to occur. The biosphere isn't a closed system. It's greatly affect by solar and cosmic radiation. Because of the sun, the biosphere has an fuel source. 2nd law of thermodynamics is a theory that talks about transfer of energy - in absence external of work, heat can only be transferred towards cooler body.

Evolution is a theory that talks about modifications that occur in living organisms.

Since living organisms exist thanks to (among other things) energy arriving from the Sun, I see no contradiction in both these theories being true. Does evolution violate second law of thermodynamics?