The Junior Boks will be in action at the World Rugby U20 Championship in the south of France from 30 May to 17 June.
All four players were in the Maties Young Guns squad that won the Varsity Cup's u20 tournament for the first time in the tournament's history this year. Sandi and Erasmus had limited exposure in the maroon jersey because of injuries, but Jooste scored four tries in the final and Dixon was named Player of the Match.
Jooste also played for the Junior Boks in 2017.
“Playing for my country has always been a dream for me, ever since I can remember. To be part of this setup and getting the opportunity is such a blessing. I have to thank my heavenly Father for the immense privilege to play for the Junior Springboks. I am living my dream. I will never take these opportunities and experiences for granted," said Jooste.
The team will meet Georgia in their opening pool match on Wednesday 30 May, and then take on Ireland on Sunday 3 June and France on Thursday 7 June in the pool stages.