Anand chose Sanam ahead of higher-ranked Saketh Myneni, who is placed 115 places above his diminutive compatriot at number 256.
Myneni had played extremely well on his Davis Cup debut against Taipei, winning the doubles as well as the fifth rubber.
In the absence of Yuki Bhambri, who missed out on action due to a foot injury, big-serving Myneni was expected to play the second singles.
"I decided on Sanam for the second singles because, though there is not much to choose between him and Saketh, the court here is medium slow which would suit Sanam better," Amritraj told PTI after the draw ceremony.
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Indians would start as favourites against the home side and the skipper wants his boys to justify the tag.
"Korea is a very tough team, but based on rankings, we are the favourites. We just have to prove it this weekend," the 60-year-old said on his second assignment with the team.
Amritraj said surface is of the liking of his players.
"The court is medium slow as I mentioned and suits all our players just fine."
The captain also said that Yuki's absence would not make much of a difference to the outcome of the tie.