The Indian team at the tournament has been besieged with phone calls from IPL agents since the past week offering contracts to play in the inaugural Twenty20 extravaganza starting on April 18.
IPL rules mandate that each of the eight city franchises should have a minimum of four under-21 players in their line-ups and contracts reportedly ranging from 50,000 to 20,000 dollars have been offered to the juniors.
The Board of Control for Cricket in India (BCCI) is worried IPL offers could distract the team, one of the favourites to win the under-19 World Cup which ends on March 3.
"The players have been told not to have contact with anyone connected with the IPL," team official Hitesh Patel told AFP as India began its quarter-final against England at the Kinrara Oval on Sunday.
"The BCCI is very strict about this. IPL team owners have been told to stay away from the team till the World Cup was over."
A website quoted a team owner as saying that several franchises were unhappy that agents had begun to poach the juniors and welcomed the BCCI's decision to shield the players.
"Too many agents have cropped up and poaching has started," a member of a franchise said.
"It's sad that young kids are being exposed to so much money so early. It would have been better had a price been fixed by the IPL board for these players."
BCCI secretary Niranjan Shah said a procedure will be worked out with the franchises for signing junior players after the under-19 World Cup ends.
Top cricketers from around the world have been signed up for huge amounts to take part in the 44-day, 59-match IPL competition across India.
In an unprecedented auction of players in Mumbai last week, bids ranged from a whopping 1.5 million dollars for India's Twenty20 captain Mahendra Singh Dhoni to the lowest of 100,000 dollars for Sri Lankan youngster Chamara Silva.