Both SDA and ODG drawings are supported in OpenOffice.org Draw, so it is probably the best option to convert SDA drawings to ODG format. Might also be possible using online conversion services like PrimoOnline or ZAMZAR.
Convert OpenOffice.org drawing file to OpenDocument drawing.
We have found 2 software records in our database eligible for .sda to .odg file format conversion.
Multiplatform software - convert sda to odg on any platform
Apache OpenOffice Draw (OpenOffice.org Draw) is a fully-featured graphic editor that allows users to draw quick sketches or complex diagrams. It is easy to use and has many nice features. Draw comes as part of OpenOffice.org productivity suite.
Convert from sda file
to odg file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sda to odg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
LibreOffice Draw is a useful software tool for creating various drawings, diagrams and other simple graphics. It's an open source program that comes as an integral part of LibreOffice suite.