The following features are unsupported in shared workbooks:
| Unsupported items: | Unsupported actions: |
|---|---|
| Creating or inserting tables | Inserting or deleting blocks of cells |
| Adding or changing conditional formats | Deleting worksheets |
| Adding or changing data validation | Merging cells or splitting merged cells |
| Creating or changing charts or PivotChart reports | Sorting or filtering by format |
| Inserting or changing pictures or other objects | Using drawing tools |
| Inserting or changing hyperlinks | Assigning, changing, or removing passwords |
| Creating, changing, or viewing scenarios | Protecting or unprotecting worksheets or the workbook |
| Inserting automatic subtotals | Grouping or outlining data |
| Creating data tables | Writing, recording, changing, viewing, or assigning macros |
| Creating or changing PivotTable reports | Changing or deleting array formulas |
| Creating or applying slicers | Adding, renaming, or deleting XML maps |
| Creating or modifying sparklines | Mapping cells to XML elements |
| Adding or changing Microsoft Excel 4 dialog sheets | Using the XML Source task pane, XML toolbar, or XML commands on the Data menu |
| Using a data form to add new data | |
| Adding threaded comments | Editing, or deleting threaded comments |
It does not say you can't sort. However, if you're having a problem with sorting, you might consider the SORT or SORTBY functions. They do work in a protected sheet regardless of the Protect Sort option's settings.