Van Der Wielen is to return to Australia later this year, following a restructure within Lloyds.
Lloyds managing director of general insurance Phil Loney will become managing director of life, pensions and investments business across Scottish Widows and Clerical Medical.
Scottish Widows managing director Andy Briggs has become managing director of general insurance.
Following the merger with HBOS it was expected that either Briggs or Van Der Wielen would leave the firm.
On Friday, Lloyds also revealed that managing director of mortgages Dan Watkins will be stepping down from his role.
Watkins, previously chief executive of retail products at HBOS, will be leaving the bank to pursue other opportunities.
He took up the role at the beginning of 2009. In the interim, operations director of mortgages Mike Kula will act as head of mortgages.
Wealth and international director Jo Dawson has also decided to pursue other opportunities outside the company and will leave at the end of the month.
Dawson was previously head of risk at HBOS and had replaced whistleblower Paul Moore. Wholesale group executive director Truett Tate will take on Dawson’s responsibilities.