I don't think there's any off-the-shelf product that allows you to convert matlab code to VB.
However, you can try convert your Matlab code to C using Matlab's code generator. Converting C or C# to VB seems more doable.
Another option is that you can try is calling your written Matlab function from VB, see this: http://www.mathworks.co.uk/help/matlab/matlab_external/call-a-matlab-function-from-visual-basic-net-client.html