Roord's header gave her side an early lead and Lineth Beerensteyn added the second goal courtesy of a goalkeeping error in the second half to secure the Dutch a date with Spain in Wellington on Friday.
Dutch goalkeeper Daphne van Domselaar was equal to everything Banyana Banyana fired at her, however, and the 2019 finalists progressed to the last eight for the second successive tournament.
Ten minutes into the second half, winger Lieke Martens had a goal disallowed for offside, but the Dutch did double the lead in the 68th minute.
Banyana Banyana had one last chance to get on the scoreboard in stoppage time, almost inevitably through Kgatlana, but there was no way past Van Domselaar.
"Yesterday we spoke about needing to score more goals and we had the opportunities, especially in the first half," said South Africa coach Desiree Ellis.
Persons:
Jill Roord, Joy SYDNEY, Beerensteyn, Thembi Kgatlana, Daphne van Domselaar, Banyana Banyana, Andries Jonker, Danielle van de Donk, Lebohang Ramalepe, Kaylin, Thembi Kgatlana's, Van Domselaar, Kgatlana, piledriver, Lieke Martens, Linda, Desiree Ellis, I'm, Nick Mulvenney, Simon Cameron, Moore, William Mallard
Organizations:
Soccer Football, FIFA, Sydney Football Stadium, South, Sydney Football, World, Dutch, Thomson
Locations:
New Zealand, Netherlands, South Africa, Sydney, Australia, Spain, Wellington, United States, Melbourne, Sweden, Vietnam, Dutch