Speaking about the allegations, she said: "I think it's a complete betrayal of both the people Oxfam were there to help and also the people that sent them there to do that job".
Oxfam said it was "shocked and dismayed" by the new Chad claims although it said it could not corroborate the claims.
She told BBC Radio 5 Live's Pienaar's Politics she was not aware of allegations within Oxfam, but had raised the issue of abuse involving aid workers in disaster zones with the Department for International Development (DfID) while heading the department.
Groups of young prostitutes were invited to homes and guesthouses paid for by the charity for sex parties, according to one source who claimed to have seen footage of an orgy with sex workers wearing Oxfam t-shirts.
But, he did admit that whilst he was "not informed" about the allegations of sexual misconduct levelled at Oxfam, DFID "did report the matter to various regulators and to the Department of International Development" they "did not specify the nature of the allegations or the nature of the misdemeanours that had taken place".
Britain will cut off aid funding from any organisation that does not comply with a new review into charities' work overseas, aid minister Penny Mordaunt said on Sunday, describing reports of sexual exploitation in the sector as a "scandal". It said significant improvements have already been made since 2011.
Caroline Thomson, chair of Oxfam's trustees, announced a package of measures to show the organisation was committed to changing.
Goldring apologised yesterday and said he was 'deeply ashamed of Oxfam's behaviour [in Haiti]'.
He added: "Everybody - the 25,000 staff and volunteers - are compromised by this, the hundreds of thousands of people who support Oxfam every month are compromised by this, and to everybody I apologise".
"I have so much respect for Oxfam, they do great work, but this is a sector-wide problem".
The government's review of its relationship with Oxfam comes amid fresh allegations in the paper that the charity failed to alert other aid agencies about the staff members' behaviour.
During the probe, Oxfam dismissed four staff members and another three resigned, including van Hauwermeiren.
Ms Mordaunt told BBC1's The Andrew Marr Show that the failure to pass on information to relevant authorities shows an "absolute absence of leadership". "If the moral leadership at the top of the organisation isn't there, we can not have you as a partner", she said.
More reports of misconduct have emerged since the original report in the Times.
"Our approach to this matter would have been different had the full details that have been reported been disclosed to us at the time", the commission said.
"This is now an opportunity for everyone to make sure that there are very clear, not just guidelines, but action will be taken and money will be withdrawn as well, quite frankly, if there is inappropriate behaviour", she said.